Originally Posted by: caponi14
...cause i don't have the economy to send them to a professional.

Not to nit-pick.....but just say "money". Economy doesn't really make sense.

To stay on topic, if you don't know what you are doing and are comfortable messing around with your guitar, you could damage it. Setting the action can't really screw your guitar up but when you get to stuff like the truss rod, DON'T mess with it if you don't know what you are doing. I suggest just reading a lot online. Google has tons of info on this stuff.