So I really wanted to make a charecter who focuses on stealing things and breaking into places. I would focus on sneak, hacker, locksmith, and pickpocket. It sounds really fun to me but was wondering if it could be viable on very hard mode (what I play on now). So can I make this work or not?

I don't see why not. I play on very hard and while I don't usually pickpocket I'm usually a tank by lvl 15 or so. Shouldn't be too tough, go for it.

It should sneak characters are op

yeah, seems possible.

Id toss my skills in either melee or anything I can get silenced, the lockpick skills asap, maybe pick pocket skills if that interests you, the explosive skills so I can set mines as trap, and any sneak/crit skills under luck or agi would help. Thinking this would end up being more of a luck/agi build with perception being important too, but not as.

With Sneak and Ninja you don't even need straight damage or upgrade perks. I have them anyway purely because I'm a cruel [censored]