Nice use of your KG. Now I'm not trained as a Kaguya, but I believe that the act of forming bones through your skin causes pain as well. So you probably didn't need to shoot yourself with the bullets, since the act of releasing said bullets would probably cause sufficient pain.
On to the next techniques.
Body Flicker is banned from use in battles, even though its on the jutsu list. The reason for this is because it can be easily abused to just endlessly avoid techniques.
Now answer the questions I listed earlier for the next four techniques:
The bones protruding through our skin does indeed cause pain, though, we've been told that using it to break Genjutsu would be considered invalid. The reason behind this was apparently because the Kaguya repeatedly experience this pain, we in turn build up a certain tolerance to that pain (and pain in general) to the point that it's no longer enough to break an illusion. If I remember correctly, someone even failed their Kaguya test because that was considered an invalid way to break Genjutsu.
Tis why I thought it necessary to shoot myself
It's kind of like a double-edged sword - Our bodies are resilient, our powers formidable, and to a certain extent, our tolerance to pain coveted; Yet even still, we'll always be visibly shook up by the invisible bully.
------
The
(Utsusemi no Jutsu) - Empty Cicada Shell Technique, a useful skill for deception, allows the user to project their voice over an area away from their actual location. The most prominent strength of this technique would have to be the ability to deceive the enemy, when using stealth, as to your whereabouts along with the number of your allies. The weakness in this technique would probably be that .... . One situation in which this technique could be used would be, for example, to set up a successful ambush by using this technique to not only hide the amount of allies one has, but lure an enemy into a trap with the sound of the user's voice. To avoid or defend against this technique, you could cancel out the sound by making some sort of noise, or better yet, use your own form of sonar to detect enemy presence (Periodically making some noise of your own and using human echolocation - Sound Release doesn't necessarily have to play any part in it).
------
The
(Muon Satsujin Jutsu) - Silent Homicide Technique, most efficiently utilized by those who fight from within the mist, is more of a general skill that allows the user to murder a target with little to no warning by previously and skillfully concealing their presence. It's greatest strength would have to be the user's incredible stealth, and the ability to dispatch a foe effortlessly, and without ever alluding to your presence. The weakness in this technique would probably be that it is in fact a general skill, and anyone else possessing a similar set of skills (being a skilled mercenary or assassin) may be able to fight back even despite one's best efforts to conceal themselves. This technique, as we've seen, is best used while concealing one's own presence within the hidden mist jutsu and assassinating a foe, making for an easy, and especially efficient method of killing. One possible way to avoid this technique would be to create clones and spread out a bit - This way, with more indistinguishable copies, the chance the real you gets found out is proportionally lower, and if a clone is killed, the information on will immediately return to you, the original, and you could counterattack.
------
The
(Kage Makibishi no Jutsu) - Shadow Makibishi Technique, a useful technique when in close quarters, the user will skillfully toss makibishi over the ground in an attempt to reduce the speed of and damage their opponents feet. The strength in this technique lies in the cloud of smoke, being used to effectively conceal the spreading of makibishi spikes, along with any of the users movements. The weakness in this technique would probably be that, without establishing some sort of elaborate ruse, it's not often that you intentionally walk into a plume of smoke clearly created by your opponent - There's also the possibility that the opponent can read the air currents depending on the users movement (should the user also conceal himself), kind of like what Asuma did when he used the Fire Release: Ash Pile Burning technique. One particular situation in which this technique could be used would be to concel the user's movements within the smoke, using the cover to create a clone after laying out the makibishi. The clone could be used several ways, e.g. hide underground and attack afterwards, act as little more than a feint by charging the enemy - Though they'd also have to avoid the makibishi, or simply using it as a means of luring opponent into stepping on the makibishi. One way to avoid this technique would be to simply rely on your senses - If someone used this against me I would either use deduction and my senses (human echolocation) to determine what's happening and the proper course of action.
------
The
(Kage Nawa no Jutsu) - Shadow Rope Technique, simply put, allows the user to bind their opponent with a rope. The strong point in this technique is that, whether used on an opponent or to satisfy a kinky fetish, the rope can be used to effectively subdue an opponent to the point of helplessness. The weak point in this technique would have to be in extremely close quarters, and outside a game of S&M, it's not too often that people willingly allow you to tie them up, meaning there's got to be some tact to it. One such instance when this technique could be used for interrogation, to keep the subject bound and in place. I'm not sure I can go as far as to state that there's a specific way to avoid or break out of this technique other than to simply not get caught, or break out using any means necessary - whether it means cutting through the rope or possibly even losing an appendage in process.