If someone was to come at us with their own additional contract, we would probably decide that we had given them enough of our time and move on. As Nick mentions below, the contractors reputation is the one on the line. They have every reason to do right by you. The crooks of the world generally don't have a reputation to stand on, and as a customer it is your job to research who you are hiring. If you can't find anything about them, they probably aren't who you want to be dealing with. If they ask for money upfront, they probably aren't running a stable outfit. We never take a penny upfront. We collect when the job is fully complete even when we are working on weeks long projects.
I can't even get anyone to look and give an estimate to complete a bathroom remodel- just the bathtub/shower part has to be done as the last person who was doing it died- the rest is complete and have all the items and materials already and paid for. once they hear that they are no longer intrested- what do they expect? me to let them rip out what was already done and repay and redone everything all over again so they get more money? and throw out brand new imported Travertine and Spanish tile?
A DIY demo does still require some planning. For one, you'll need the right tools: likely a sledgehammer, a large crowbar, a pry bar, and an old claw hammer you don't mind ruining. Make sure you know what's behind the walls—especially electrical wiring and water pipes—before you start swinging. Finally, don't assume your demo won't cost anything. In addition to tools, you'll probably need to rent a dumpster or hire a hauling service to cart away debris.
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.
I have a miserably small master bath with a particle board subfloor (house built 1969), so I must guy it. I bought toilet made for small bathrooms, and plan to pull the cabinet sink, replace with pedestal, raise storage like lighted bulkhead, demolish tile, and widen doorway from 28" to 32". I might gain 6" from tile removal alone, plus but another 6" on entrance with cabinet sink removal. Since large expense is in demolition, I could do that. But, install showers is tricky given the drain leveling so I'll hire a pro for that. Question: gutting, updating and repairing master bath is necessary, but to what extent should I go i, terms of resizing, which would entail bumping out wall into adjoining small room, which then adds expense of finishing that where window placement restricts encroachment. It's a nice older brick house that I bought before I realized the made of lapses and oversights by the home inspector (who also is a local top police official in a town with highly subjective law enforcement). I need to fix, list, well and leave. Any thoughts (and prayers much appreciated).
Between the two options, pick up one tile design that suits your necessity and budget. Remember to put forward safety for your children in this point. In case your budget is limited, you can partially change the tile. Determine which part of the bathroom that needs new, safer tiles. This will definitely save more money compared to overall tile changing.