before I post the following video, I must say, please be advised against mounting your own skis, that being said, here is a video on "How to Mount Bindings Freehand", I believe he'll answer all your questions in there. How To: Freehand Mount Ski Bindings from steve power on Vimeo.
oh, alright, as long as you know somewhat about what you're doing. I've seen a bunch of posts about mounting bindings by people who don't know what they're doing. Glad you go it cleared up.
Binding drill bits are made to allow you to only drill so far into the ski. I would just look at the binding screws and choose one that is a smaller diameter and only screw a little way into the ski. Place some tape on the bit to make sure that you drill a precise amount into the ski.
FKS but i found it marked on my skis. Its been a while since i've done any mounting i forgot they usually list it on the ski. Thanks for the offer tho.
and just in case anyone searches for this info in the future this is the link no_steeze sent to me.