aldav53, You need to read maintenanceguy's post in the 'having trouble' thread. His is a most informative post for those of us that are just starting to go out on our own.
I too have trouble charging what is a fair price for my work. I didn't feel nearly as bad about charging for my work after a recent visit to the auto repair shop though. They wanted $108 to change the idler pulley on my Blazer, I changed it myself in about 30 minutes and the part cost $14.
I'm still lower than the guys that are doing this full time, but I can afford to be, I don't have near as much overhead.