Like I said, you should do some reading and learn the details. If you can get the info from the manufacturer even better.
There's a whole bunch of things you need to know but after you do it once or twice, it's easy after that.
For which direction to turn just remember "righty-tighty, lefty-loosy"
Clockwise to tighten the strings, counterclockwise to loosen em.

(of course all of this assumes that the person doing this has at least a half a brain in his head and a little life experience. If you have severe tween disease, tend to trip over things a lot or your mom still has to constantly remind you to clean up your room... ya might wanna think about getting somebody more experienced :cool: