The first step in installing the color filter wheel (CFW) is to prepare the work space. It should be a clean environment.  You will need the two supplied hex head wrenches (a 1/16th inch and 3/32nd inch), the CFW, and perhaps a can of compressed air.  Also, it is a good idea to thoroughly wash your hands to remove any oils which might contaminate the CFW drive O-ring.  After all this is done, remove the four screws that attach the front cover to the camera.