1. Studying law
2. Not always.
3. Only if you don't have a problem memorizing hundreds (sometimes thousands) of pages
4. I wish I could have become a pianist but it's too late now T_T
5. They say always choose what you are interested in and what you are good at. Some say choose a field where you can potentially earn a lot. Originally I was in a physics/math class at highschool- I could have majored in something related to that, but I didn't like the teacher and I started to be interested in history/literature (in my country university admittance depends on the results of highschool graduation exams and the performance through highschool; you can get extra points for certain activities- for example an advanced level exam from a subject: that was history for me, as it's required for law). I could have also chosen something related to history/literature... But I thought that law will be more paying off in the long run. That's true, however, unlike in some rich countries, here not even lawyers earn that much. The minimum wage being ~600$ /month (net) for starters if you have a degree (+premium benefits depending on the employer)- well that's not much, but considering that the average income is ~700$, it's enough to make a living. And you can always work your way up.
I'm having a summer job at the tax authority- full time (8hrs), and as a student I earn 400$- and my job is pretty easy. No responsibility- I'm just helping out with paperwork. The administrators- who do the real work-, government officers earn the avergae 700$ without a degree. It also depends on the time spent in state administration- there is a fix wage board where every 3-5 yrs your wage will be increased with a certain percentage. And of course in leader position you can earn more. My mother with a degree, has been working in the tax authority for 25 yrs, earning 900$. I guess this is a ridiculous money for Western-European or American people where a baby-sitter earns more than that. However, that's just state administration. In the private sector, you can earn more- or less. In some law firms, they actually pay less for starters, saying that the experience is priceless xD (no joke). You need to serve 3 yrs to become an advocate so yeah. In the most prestigious law firms it's even you who pays for them to employ you- weird, isn't it? Not to mention that they overload candidates, they work all day and night, even at weekends. Yes there are firms where the requirements are not that harsh- but competition is tough: someone with good connections and/or a better degree has better chances. There may be further requirements (knowing foreign languages, doing PhD, etc. Sometimes even your university matters.) So, thanks, but I'd still prefer state administration. Sure, the job must get done in time in state administration as well- but you won't lose clients and money if you don't do 200% performance. As for judges/attorneys: you also need several years to qualify and it's hard to get admitted in the system. You can also try working for companies, but civil law is not really my thing anyway.
You can go abroad- but law is quite a particular thing: I mostly learn the laws of my country (and some EU and international law), so most probably I couldn't work as a lawyer abroad- unless I do some supplementary education- but that's expensive. I'm on state scholarship here.
Well that's just my country- the mentality here is study languages so you can go abroad- there you can earn more even without a degree. xD