When someone asks you a price for a repair, quote that single repair only. Resist the temptation to quote other jobs that they ask of shiny ball fashion.

The reason for this he explained (and what I later found to be true) was that if the cost of everything asked for was to high many times the customer ended up doing nothing.

So you get the first job locked up. Once you have that work started or the price agreed to only then do you quote additional work.