holy shit dude.....most the ppl on here are completely lying and if you listen to them, you will fuck up ur new skis.....i dont recommend mounting ur bindings urself, but ill try to show you how anyway.
1) Get a drill ( A drill press works best because it drills straight down, which is hard to do with a hand drill)
2) Get a drill bit that is a little smaller than your binding screws (you DO actually screw in the screws...the glue is just used to hold them in place so they dont loosen up and to seal the holes so water doesnt get into your core)
3) Put tape or mark the bit some other way so you dont drill too far into the ski (do this by holding the drill bit next to the ski, with the tip of the drill bit above the top of the edge) place the tape where the drill bit is level with the top of the ski (i recommend marking the drill bit 1/4 inch from the tip of it....Sry that this is so confusing....im having trouble trying to explain....
4) since ur doing this to invaders, i recommend center mounting them.....take your ski boot, and place it on the top of your ski, so the small mark on the underside of the center of your boot is lined up with the small mark(with invaders it is a silver line) that says center on your ski....when these two lines are "touching", i like to take a marker and draw a line at the toe, and heel of the boot on the ski, so you know where your boot is going to be.
5) now take your bindings, and with the boot still lined up with the center mark of your ski, put the bindings on the ski, so they are pretty much holding the boot in place(like they should be when mounted)....to make everything easier, take the brakes off of your bindings.
6) with the bindings in place, and the boot "clicked" into them, pretty much just eye everything up to make sure there is an even amount of space between the side wall and bindings on each side of them....from there, i take i needle or something sharp, and with the screws removed from the bindings, put the needle in each screw hole and push it hard into the top of the ski to mark where you will drill.
7) remove the bindings and boot from the ski, and you should be able to see the small holes you made with the needle.....take a permanent marker, and make the small holes more visible by just making dots over the holes with the marker
8) now drill into the holes
9) when the holes are drilled, put the bindings on the ski and screw them in.....the screws should be semi difficult to screw in because the holes you drilled should be smaller than the screws, but the screws should be able to be screwed in.....screw the bindings in, but dont tighten them.....once the screws are semi way screwed into the skis, unscrew the bindings and set them aside. You did this step just to ensure that the screw holes are where they are supposed to be, and that the bindings can be screwed in properly.
10) Put glue in all of the screw holes, and screw the bindings in until the screws are tight. Be careful because if you drilled the holes too deep, screwing the screws in until they are tight will mess up the bases of your skis.
11) Do the above steps to the second ski
Im sorry that this guide sucks, but im too lazy to make pictures, and its really hard to explain
DISCLAMER: This is a guide made to help you not fuck your skis up.....if you follow this guide but still mess up and ruin your skis, its not my fault. My real advise is to take the skis to a shop, pay 25 bux or however much it costs, and have them mounted by a professional who will use a mounting jig, which is made especially for mounting bindings.