I don't remember what I used on Rawhide, I think it was a small straight screwdriver. Might have been a dental pick, cause I had a couple of them out too. It took awhile to get the clip off, then getting the switch out and the new one in wasn't fun either. I played with the clip a bit and then it just popped into place....as we say in the South, I guess I held my mouth right!
Other than just firing the parts cannon, since these frequently go bad right after the booster unit is replaced, why don't people go ahead and replace the switch while they have everything disassembled?