1. Observe and protect
Document what's showing up, limit additional damage if it's safe, and gather any relevant history.
2. Evaluate the house and site
The right fix follows from checking what actually shapes the problem: fixture performance, pipe material, pressure, how drainage and venting are laid out, shutoff access, physical access to the work area, and any prior repair history.
3. Define a written scope
Preparation, protection, materials, access, permits, testing, cleanup, finish restoration, exclusions, and change-order terms all belong in a written scope.
4. Compare providers
Check credentials and compare the reasoning and boundaries behind each bid -- the total alone doesn't tell you much.
5. Inspect closeout
Confirm testing, cleanup, documentation, warranties, and remaining maintenance responsibilities before considering the job closed.