Ok, i have an Ibanez G10 with a Tune-O-Matic Bridge... its just like they have on Gibson Les Pauls....is it alright to raise/lower the bridge...or is it gonna do harm to my guitar.... do i need profesional help with it?

You can lower it, but you will have to check your intonation after you get it where you want it.
^yup. It'll screw with your intonation and action. While you're at it make sure you've got the truss rod adjusted how you want it too (which can cause the neck to strighten or warp some between where it mounts to the body and the nut).

It's all relitively easy and safe stuff to do yourself as long as you're not taking things clear apart.