I did tiling for the first time when I tiled my backsplash and I can give you some advice from one beginner to another (not meant to replace the advice of a pro, but just might be some things that a pro takes for granted since they are good at what they do). IMO the way to get a professional looking job is to: 1) take your time. It's not going to go quick, that comes with practice. It took me a week to do my backsplash, a pro would have done it in a day, but I got a professional look. 2) use spacers. If there are no lugs on your tile to give the proper spacing, use spacers. I will never forget watching some DIY show, maybe weekend warriors, where the guy was like "I don't need to use spacers, I have a good eye." Oh what a crappy install THAT turned out to be. Again this is a practice thing, someone who does this all the time might be able to do it without spacers but you don't have that much practice so use them. 3) never work with someone who doesn't have the same standards you do. Tiling is not necessarily a 2 person job. 4) Try out one of those cheapie tiling kits at home depot - the one that comes with a cheap, half circle shaped piece of tin for spreading thinset. I have kind of small hands (definitely smaller than the average man) and found that this tool was MUCH easier for me to control than the larger trowel. Sure, you can't spread as much at one time but see #1. Even with the trowel, the thing is notched to make sure you get the right amount of thinset on the walls. Use the right size notches (maybe bill can help you with that and also some tips for applying). 4) Buy more extra than you'd need for a pro and don't be afraid to use it... to re-cut anything that needs to be re-cut etcetc.

Windows in a shower can be very problematic. Perhaps you should leave the window as it is and add an exhaust fan.

Ductwork all runs through the ceiling. Or rather, along the tops of the ceiling, UNDER the ceiling and inside the room (rather than up in the attic, though there must be a place in the attic where the furnace connects to the heating ducts) In fact I'm pretty sure that's why they put that stupid "bookshelf" there (with the shelves too close together and NOT MOVABLE eg too short, and too deep for actual books and also not suitable for decorative items either, LOL!). Basically it fills in the space under the ductwork, where in the kitchen (on the other side of the living room wall past the bathroom) the ductwork runs over where the wall cabinets are. The story of these houses is a little weird, they were supposed to use plans that included WOOD STOVES (wonderful way to heat in the desert where trees don't grow) but instead used plans intended for a different Air Force base in another state that included oil furnaces. Thankfully. But the oil furnace was replaced in the 70s or 80s with a forced air gas heater and that was pretty nonfunctional (wasn't even correctly connected to the ductwork). So we had that replaced and the existing ductwork at that time was all up through the attic and running along the top of the ceiling in every room. Anyway so originally they intended to build houses that would have included a connection for a wood stove but since they didn't actually USE those plans I'm pretty sure it was purpose-built for the oil furnace originally, since those were the plans they actually (accidentally) used. Maybe there was/is some stuff involving the old oil furnace in there ... That room is WAY too big for a "coat closet", plus the actual coat closet (also somewhat oversize but still obviously closet-ey) is just around the corner there. The "weird" room is 4 x 6.25 and would be 5x7 ish if it weren't for the weird bookcase and offset back wall with apparently blank space behind it. The coat closet around the corner is extra-deep and larger than any other hall closet I've ever seen @ 38.5" deep - more than 3' deep - and 41" wide. It's HUGE for a closet but at least it actually looks like one. As for that odd space seemingly blocked off there between the bathroom and the weird room, I guess I'll need to take out a bit of wallboard and look. Just seems so odd ...

Fragrance by toilet can be nice, whether incense on a tray or dried lavender... open window a hair. On the toilet lid / or on a shelf or two: LED candles also. https://www.amazon.com/Generic-Tea-LightCandle-Holder-Percent/dp/B095QH8WFT