Estimating jobs...

Let the customer set the tone. Talk together about specifics of repair or build. You know where you need to be for work required.
Ask customer what type of budget they are considering for the work. Makes them very comfortable. Process paperwork with agreement terms in front of client.
If not doe-able on what they state explain cost involved and move on to next client if necessary.
Undersell & over deliver.
If you go over estimate to client. Eat it unless extreme unforeseen issues.
Your rep is everything and i can say from what I've seen of your work you already have a great one.:thumbsup: