I am also pretty handy, but some things I think I'd rather hire out. Our shower stall (in our master bath) was pretty decayed and had ruined the ceiling in the kitchen (below) with a leak. I wanted that damn shower floor in right or have someone *else* to blame! I hired a plumber to remove the old one, install the new one, and install the new shower valve. I did everything else myself.
We did marble on the floor and vanity top, and subway tiles on the walls (wainscoting), in the shower, and on the shower ceiling. The wet walls were underlain in a board like hardibacker, but made by GAF (that's what our tile guy stocked). They didn't even stock the cement backer because it is so gawdawful to use.
Lessons learned:
Hire out the stuff you do NOT want to have to redo if it goes wrong. For me, that was the shower guts (floor and valves).
Talk to as many people as will entertain your inquisitiveness. Our tile guy was absolutely invaluable. And very encouraging. We even brought him pictures and he gladly critiqued out progress.
Do not use marble. If you feel you want to ... call me. I'll slap it out of you! We (me!) just **had** to have rojo alicante marble. Our tile guy tried to talk me out of it. Nope, I wanted that "deep, rich color that no imitation can match." (Sparkly: "Get over yourself, H2S" H2S: I'm a stubborn old coot who wants m-a-r-b-l-e.) But she was sooooo right ...... the stuff's a pain in the ass once it is installed. It etches, it stains, sealing is a joke. We have hardwood floors throughout the house and we have to wax our friggin' marble. The wood does fine. The marble? Ha!
Here's the marble:
Soon after installing it I found they made a very, very convincing rojo alicante stand-in in tile. How dumb am I?
Allow for the time. Ours took me almost all summer to complete. But I was working (for my pay) very hard as I was also trying to get that done. We had a blowout business cycle last summer and I hardly had time to eat let alone do dat batchroom.
If you're going to do any substantial amount of tiling, buy a wet saw. If you calculate the rental based on the days you'll use it, buying is cheaper. And it makes the job a **ton** easier than the old score-n-snap cutters. I also found that a small (4"? 4-1/2"?) angle grinder with a masonry blade was very handy. And a Dremel with a masonry bit. Amazing how much I used *that* little jewel!
You're gunna love your new bath. I just know it. Having seen pictures of your lovely house, I know your hubby can do it right!
Post pictures when you're done (which will be ...... oh ... August, mebbe :))