My buddy used to do this. It is going to be commission only, and apparently you have to meet your quota. It will be very very hard to get 3 sales a week. You basically have to make the people comfortable with you, and you have to figure out a way to get them around their deductible with their insurance company for them to agree to do it. A lot of them will complain about paying for some of it up front before you do the work as well. Also, a lot of times you will have to send them to your collections agency to get the money, because they will not pay when the time comes. This is just what my buddy had to go through though, I do not have personal experience with it.
My buddy hated it with a passion though. He quit it to go work at Publix.