Hi Larry,
The
Pinnacle website has a very good training video on PC usage, and this site has more articles on the topic than you can shake a stick at.
I know from experience that it's very difficult to find someone to teach technique in Ontario, so I would advise trying by yourself (using light to medium polishes and pads) and being very careful at first.
You can get some really good advice rom this site if you describe your vehicle and take pictures to show what you need help with. Good luck!
Kenny