I put ///M -tech pedals on just a few weeks ago and I had the same question you did. Your existing dead pedal is on with plastic rivets...you know like things that once you pull them out they cant be used again.
1. To take it off simply put a flat head screw driver under the silver part of the dead pedal, try to get about 1-2 inches of the screw driver in, it will get easy as you break more rivets (might want to cover it with a thin rag to prevent any scratching) and pry the pedal off. You will hear/feel the rivets as you break them.
Once the pedal is off you will better understand what I am talking about. If you ever wanted to put the pedal back on, you would simply have to buy a new middle piece, the black rubber. (Once again you will see what I mean once you have it off).
2. After that just screw your pedal in. I didn't even drill mine b/c I didnt want to strip the plastic, so with a screwdriver just screw the screws in applying a fair amount of presure. Good luck.
Nick
PS-- Dont worry it wont break or bend or anything, the peadal can be put back on.