I'm level 8 now, i'd like to go into archery, sneak, lockpick, alchemy, pick pocketing, one handed and light armor (thief/assassin sort of build). Is it going to hinder me doing this? I don't really want to play a weak character that doesn't scale well late into the game. I also don't want to be a one trick pony, I find that to be boring. So before I completely mess up my skills and have to reroll I'd appreciate some input on this.

from what ive calculated it make sthe most sense to use 4-5 skills. youll reach the top of every tree but leave out branches you dont need.

Thanks for the info. I guess I'll put more perks in fewer skills.