Some guys are really good at this sort of technical stuff.. they can just take the guitar apart and put it back together, understanding how everything is working, and therefore make custom changes that get the guitar playing just the way the want it.

I'm not one of those people, and if you're not too, I'd recommend taking the guitar to a tech if you can. You can really throw stuff out of whack and then really find it hard to get back to how it was before. Just make sure you get a solid estimate from a reputable tech, and put a "don't go beyond this cost without calling me" caveat on it.