if you don't have a dremel tool, you can do what the honda mechanics do. Just take a flat head screwdriver and "tap" if onto the head of the rivet with a hammer or mallet. This will create a slot for the screwdriver, and then the rivet will just screw out like a screw normally would. As for position of the thing, Rice burner is technically right, but I've done a TPS change so many times and never had a problem so, I'd say go for it. Just change it out for the one in the old motor.