How To: Freehand Mount Ski Bindings from steve power on Vimeo.
I wouldn't recommend it unless you actually know what you're doing/don't care about your skis. If you have a jig, that makes it easier, or you could find the paper jig which would make it a little easier. But, like I said, I would really, really recommend just getting them mounted at a shop, unless you really know what you're doing or just really don't care about your equipment, because you CAN completely wreck your skis, or even hurt yourself.