1. Depends on where you are. Mounting can cost anywhere from 20-120$. Most of the time you will be looking at 35-45$ for a mount, just look on your ski shop's website or go in and ask them.
2. I would try them where they are right now, if you hate it then you can go in later and get them remounted.
3. A rule of thumb is to mount no more then 3 times per ski. As for it being a hassle, that depends on how often you use the skis and how much you want to spend, like I said you are probably looking at around 40$ to get them remounted and depending on the shop a few days with them at the ski shop.
Home Mountain (more like hill): Wild Mountain, MN.
Come ski with me.
"If you don't try and push yourself, you WILL get bored and quit. Use that as your motivation to hike back up and try that rail again. Because if you give up on the rail after your first try, how can you expect to go anywhere with your skiing?" -Drail
"tl;dr Fuck you, go skiing... It's actually still a lot of fun!" -Mousseau