All you need is the RockBand 1 (I haven't tried with the RockBand 2 drums yet) drums, a screwdriver, and possibly the knowledge of how to make a simple splice.
Here is a video of me playing with them (for the first time)
Step 1: Dismantling the Drum Set
-Next you need to unscrew all the screws on the backside of the RockBand drums, and basically every screw you think will help take it apart
-After you have taken all the screws out, if the plastic pieces don't separate easily, there are also some screws under the foam inside of the middle 2 drum
You should be able to take the yellow and blue wires out, but the green and red should be stuck in between some plastic