Our master bath is a 3/4 bath (no tub) and the smallest one in the house. Weird, I know, but it's an older home. We really need to do something with it since the shower is gross - the tile MIGHT be salvageable (it is beige) if we re-grout but the shower pan and door have got to be replaced. The bathroom floor also needs to be tiled. But, we could probably buy a box of large tiles at Home Depot for the floor and have some left over - the bathroom is that small. The toilet is almost new and the vanity and sink are in OK shape. How much would this cost us potentially, with or without re-tiling the shower? And what's the level of difficulty? We replaced the toilet ourselves and that probably is our limit on DIY know-how. We have room to expand the bathroom, but since we're not planning to be there much longer (2 years max) it really isn't worth it. Our house as a whole is more updated than many others in the neighborhood.
I do not speak "DIY." Around here, it's pretty easy to put feelers out on neighborhood list serves and FB groups to find out ballpark figures for certain kinds of renovations done by local contractors.
Eta: I meant to say you might get better answers if you ask people in your area.
We just updated a tiny bathroom. We left the shower tile for now but will replace it when we do a full reno. I painted ($40), took up the laminate tiles and stained the concrete ($50), replaced the vanity lights ($40), replaced the mirror ($40), painted the vanity ($40), hardware for the vanity ($25) got a new countertop/sink ($200) and new faucet ($160). I am really happy with the way it turned out. It looks like a new bathroom but didn't cost a crazy amount. We wanted a new vanity but the cheapest were around $600 so I tried my hand at fixing it up and love the way it turned out.
I think if you can replace a toilet you can do tile. There are lots of YouTube videos and you'll be able to make corrections along the way for crooked tiles or mistakes. You can get some really pretty tile for cheap at the Depot. I'd consider an accent tile of some sort on the shower wall.
Oh yikes mrslisa that original bathroom is eeeeek. Our problem is mainly the materials - peeling linoleum on the floor, original fixtures in the shower, and highlighter-orange walls. I call it screaming orange. It's...not cute.
I can commiserate on the tiny master bath. I'm in the same boat. Floor tile is relatively easy but just make sure to use the proper underlayment to avoid cracked grout and tile in the future. The shower pan is harder because you need to be really careful about waterproofing. I'm not sure if you can even replace a pan without doing the wall tile though.
If you are just retiling the floor, that's mostly easy and can be fairly inexpensive. DH retiled our small guest bath with that tile that looks like wood and that was about $200 said and done. We redid our master bath but left the floor. We took out the shower pan and had the shower and bathtub surround (which won't apply to you) retiled. We also put in a frameless shower door, which is totally worth the expense if you are considering it. The tile guy did say he could just remove pan and tile the floor of the shower but it will look like you are trying to match tiles that can't be matched.
We redid a smallish 3/4 bath for about $4k last year. That included new tile floor, granite countertop, sink, faucet, mirror, lighting, shower door, shower head and knobs, towel bars, and cabinet hardware. We also had the existing vanity and wainscoting professionally painted. We did not re-tile the shower, replace the toilet, or move any fixtures around.