A few years ago I remodeled the only bathroom in my house. What I thought would be a small re-tiling project that would only take the better part of a weekend turned into a full remodel project lasting 30 days, so my advice to you would be to make sure you have alternative accommodations if your only bathroom will be out of use for more than a day or two.
While repairing some broken tiles in my shower stall, I discovered that I had some water damage in the wall behind my shower, so I gutted that wall down to the studs and totally rebuilt it with new backer-board and plastic sheeting that would help prevent future water damage.
I also replaced some of the original plumbing that was at least 60 years old, and installed a stop-valve that would allow me to shut off water to the bathroom if I ever needed to do so. Once those repairs were made, I re-tiled the shower stall and extended the tiling an extra 12 inches above my head to protect areas of the wall that usually got wet when the shower was in use.
I chose a white tile (the previous tile was an odd pea-green color) because I wanted a calmer, more neutral look. I also repainted the walls a neutral gray color, re-sealed the bathroom ceiling, installed a ventilation fan, and updated the light fixture.
When I began the project I was excited because I did not yet know how long the process would take, and I wanted to prove that, as a single female home-owner, I could take care of home repairs all by myself. Although the remodel process was very frustrating, physically exerting, and time-consuming, I was very pleased with the results and glad that I had taken the extra time to make those necessary improvements.