I choose not to do almost everything
I keep the house clean, and I do gardening. After that things get iffy.
Inside I will paint some rooms with low ceilings, but many rooms are wall papered and I choose not to do that because exact measurements are required and I would be very upset if I ruined a strip of paper, plus I want it done exactly correct. If I hang it I would put up with mistakes, if someone else does it I will demand perfection.
I don't paint rooms with taller ceilings because I don't have a ladder tall enough to reach and even professionals use scaffolding which I am not going to buy just to paint.
I will change plates or sockets on electric outlets but I cannot run wire in the house. All of my house wires run through conduits from the basement to the upper floors through the walls and fishing wires through that and then getting to the correct wire is more than I want to deal with. So that's it for electrical.
I will install washers in faucets, replace a faucet, replace the insides of toilets, even replace a toilet, but do not do any other plumbing work in the house--after the pipes leave the basement I don't know exactly where they run through the walls and the pipes are old and stuck together...let a pro take care of that mess.
I will clean my HVAC air filters and wash the outdoor AC unit, I know how to select the speed ranges on my HVAC blower and I let the HVAC pro take care of the rest because I am not messing around with natural gas.
I clean the filter of my DW every 45 days, and I know how to change the cycle parameters in the technicians menu and other than that I let the repair person fix the DW. Fortunately in the 8 years I've had it I had one repair under warranty. I've seen the inside mechanicals.... I recognize nothing. Oh wait I know what the motor looks like. It is so big and long I would never attempt to do anything with it...I just look. It's a Miele so I couldn't get the parts even if I knew plus I would have to remove it from my cabinets and I want everything reinstalled perfectly - so not a job for me.
Same for the washer one repair in 11 years It looks nice inside--- full of 240V stuff - not touching it.
Outside there is not much I can do. I keep the area clean. I spray down the outside shutters. I cannot wash a window because the bottom of the windows on the first floor are about 7 feet above ground and that requires a taller ladder. The upper floors require an even taller ladder and I am not getting up that far to do anything..besides I can have the outside windows washed and the gutters cleaned for $120 and that is better than me on a ladder about to fall off while doing a crappy job.
There is not much to paint outside except for around the windows and I can paint, but again that requires a tall ladder. I am dizzy enough sitting down so no point getting on a ladder outside. Heck the pros won't even get on a ladder, they paint using a cherry picker(?) I think that what it's called. They drive down the street, get in the basket raise it and then paint...no sense me on a ladder to fall to the ground.
So compared to what many on the site install and maintain - I know I am limited.