[scottyb]

My advice is don't sit in front of them in a chair. People work better when they feel comfortable which means trusted and appreciated.
Do keep an eye on them and ask a few simple questions. A great way to keep an eye on them is to drop by with a cool drink and then come back in 15 min with a refill.
$60 is within reason and $75 is the high end of the $55-85 rate I hear.

Explain when he gets there what your budget is? ask for an estimate. Brakes are usually $125 - $175 installed.