Once your new materials have arrived, the tearout begins. This involves removing everything from your bathroom right down to the studs. At this point in time, if there are issues with water leaks or mold, they can be addressed. It is at this stage that hidden issues are usually uncovered. Keep in mind that issues can dramatically impact your costs, depending on what is found. For example, mold remediation starts at $500 and water damage can cost as much as $2,700.
Yeah, I feel your pain. I'm in Alabama, one of the lowest income states in the country, and I got a quote from a "big box" hardware store here. $39,000 -- to remodel a 9 x 12 bathroom. I won't go into the details but I'll tell you that the estimate included $3600 for electrical work. Uhh, we are simply switching out 2 'regular' outlets and putting in $20-dollar GFI outlets. The wiring is fine (I know because I've been in the wall before). So don't go to the "big box" stores unless you want the highest possible estimate (oh, yeah ... I had to pay for the estimate as well).

Top that with contractors that don’t even provide a drawings, plans or official documentation of their intent and we can see where their seemingly in control of the market. Their swagger is even more overloaded when they’re excited to come view your home yet can’t call you back week after week months later because they’re too busy to even consider your meager $30-50k one-room remodel.
I acted as general contractor and did all my own demo to remodel my 6x8 bathroom. I hired subs individually to do most of the work - an electrician, a plumber, a drywall guy and a tile guy. I painted the walls and the ceiling. I replaced everything except the cast iron tub. Materials and fixtures cost around $2000 and labor was about $3000. My subs had no problem with me supplying the materials, because I discussed their job scope in advance. This project took 6 months but I did have another full bath to use in the mean time.