Ok, Thats correct but you missed out
Others could also disturb chakra flow, so yeah having a buddy for a helping hand
Now, lets try to first genjutsu:
Genjutsu: Kokohin (Illusion Technique: False surrounding)
Rank: D
Type:Supplementary
Range:Short
Chakra Cost:10(+5 if you use it double)
Damage Points:N/A
Description: The user controls creates a false surrounding which can change the way an object or small area looks(if used double then its a layer of false surroundings not easy noticed by the enemy).
Focus on one area and try to change how it looks. It will trick the opponent and is better to be used twice so they will not see the genjutsu in place at first.