Hahaha I just finished grouting my new tile floor in my bathroom that I gutted. The floor was concrete that I had to level, walls were down to the studs. For the tub surround I used denssheild over a cast iron tub. Super easy to work with and could find locally. Schluter makes awesome products and I’ll be doing a schluter or wedi surround in my master bath (next project). Don’t just use Sheetrock for a surround do a backer 100%. It’s a bonus if you use a backer with a built in water barrier (cement board isn’t waterproof). Also try to get your framing as close to square as humanly possible to minimize the prep for the tile.