Be in a position to observe everything, and that will knock off a lot of rough spots for the process.

Just observe, and they will tell you everything."

Because of the percentage basis, I feel it's much easier for the average person to be able to observe the work in place and either generally agree with the pay application, or to not agree with it and highlight specific area's of dispute. 

If you don't want to be bothered to answer a question that has already been asked 100 times, then simply don't engage and just move on to the next topic.Thanks for the observation @Ben Zimmerman.I've been thinking about incorporating search into new forum posts.

My observation is that if you find a good deal, you will have people coming out of the woodwork to buy it from you.

Once landing and arriving in the City's center they both observed none of the locals wearing any shoes.The first Salesman phoned back to the states stating, "What DA Hell?

there are some great articles in the charlotte observer about entire neighborhoods affected by "funny" financing.

or observational factors such as is their car clean?

I observed new PVC, copper, furnaces, water heaters, etc.  

I usually start by giving simple tasks, observe the work, and then decide whether or not to continue on with that person.OK-- to my current dilemma: I used a plumber who was recommended by a well-known local investor in the Tampa area.