I would assume Fort Myers would be a good bet for you nearby. 

why bet against yourself and your own analysis?

As I stated above, I would bet 1K this supposed buyer walks if he has no success.

Good luck and go slow, this is going to take some touch, and a lot of guys who try to do this kind of adjustment don't have the hands or the patience for it.

I'll bet there are all sorts of things still left to do with the first one!!!

Your best bet for a good appraisal after the improvements is to document the cost and provide it to the appraiser.

I bet there are a lot of people who make a post asking for a mentor and then never follow up on it.

I bet you can’t get it off of there.

There water meter attachments you can buy that measures the amount of hot and or cold water you can put on the pipes that are going to their fixtures.. but I would bet it's a leak.. the water departments usually give you a one time break in that case   hire a plumber to do a pressure test starting at the meter 

If the answer doesn't involve an actual "show and tell" session, you can bet they will leave you hanging when you have actual money on the line.