T&M, leaves the owner in wonderland, and can lead to arguments, on every step of the job.

Les, In 6 yrs this has never happened. It is in how you sell it. And then how you perform it.

The other side of the coin would be, you do one contract for "investigating", we'll say the first contract is for $1200. Your tech says it might take a day to look over things.

One hour latter the customer is screaming that you ripped her off becuase it only took one hour to find out everything looks good and just needs finishing. I doubt you'll get paid.

Just looking at both sides fairly, mind you.