because the tremolo is not balanced... find a walkthrough on how to balance it. or for a quick fix, just tighten the screws at the back.
ur gonna have to adjust the trem springs. its not "hard", bu its can be a serious pain. your gonna wanna tighten them a little (the screws that connect the strings to the body. do them evenly, and your gonna save yourself alot of time by having a pro do it.
i <3 my gibson.

proud member of the anti-ibanez milita. my rg1570 was the crappiest guitar i've ever owned.

Quote by Rankles
Christ. I'd hate to see you break a pencil, you'd probably go on a killing spree.
Pull the center cover off the back and make sure all the springs are screwed down tight, and that nothing is loose.