To distill Dempster's post, some things I've learned along those lines:
Quality is number one and you can charge more than the competition for that. Every swingin' dick wants to put in an windshield for $150, but he won't be there next month. Guarenteed.
Communication with your customer is so important. The pre-inspect is huge, and when you encounter issues after the removal, you need to address that with your customer. It takes more time, but in the long run, that guy is going to trust you and you will gain A LOT of business this way.
Time is money but Money is time. Give your customers time. They will love you for it and all their friends will be calling you. Next thing you know, you will be booked out a month. 5 per day (as a mobile guy) is a damn good number (I think), especially when you can charge more than your competition because you are attentive
to customers. They don't even shop around when they are referred to you by a friend. Quality over Quantity should be the rule in this business. Safety is number one.
PS: I was not the best Glass guy in the Flathead
but cheers to Dempster for being so. He is a very dedicated and well respected competitor of mine.