jeff56
Had the same fears/apprehensions as you do now. But after attending the detail class, I came out better educated/more confident about using a PC. This is my first time using a PC and theoritically, it is almost impossible to do harm because of it's action: DUAL ACTION, RANDOM ORBITS (vs. rotaries).
Go to Meguiar's site, there's a special in progress for a PC with Meguiar's LIFETIME WARRANTY for $149 (PC+freebies). I know you are a ZAINO user but their PC special is an awesome deal:
http://www.meguiarsonline.com/
I don't think I will ever detail again w/o a PC...specially a big black truck with a big black lid.