I am very hands on and not afraid of confrontation.

Take a break from the forums for a bit bc you're making my attempt to gain info very unpleasant whilst at the same time being confrontational, presumptuous, and incorrect.

It avoids a lot of confrontations.

Confronts his tenant.

When I confronted them, they defended their quote, stating that they go off the industry standard and a portion of the labor time is for "testing the system after repairs to ensure safety."

I confront the offenders myself. 

I have used Coach Carson's recommended spreadsheet from "Woman Builder" (linked), and it's excellent for listing all the various cost categories I may confront on a project.

I cannot agree more.Interestingly I just got confronted with #3.

-As for the unauthorized occupant, it sounds like you need to confront the tenant, make sure they understand that all persons over 18 years of age need to be screened and added to the lease.

They confronted me about selling their property by the end of the year.