It's too bad you spent all that time and effort only to build your stairs sideways. I think they'd be more useful going up and down.
With dad's help, I built my house, 32x60 garage with auto lift, woodshed, and currently finishing out the basement. I (we) did it all, all the way down to laying sod and doing sidewalks.
A couple that I'm proud of lately are fixing a bum TPMS on a Honda. Needed a tire rotation tool (yes, it's a thing) for the "new" truck and upgraded to one that will communicate with the sensors. It found which one was bad, and I replaced it with a $13 ebay special. Dealer would have charged $200, I asked.
Another was the AC on the same Honda. Took longer than it should to figure out, but the AC clutch wasn't holding (lead to erratic pressure readings because the high side was bleeding down into the low side). So it would work for a bit, but not all the time. Anyway, found a guy on youtube fixing the same problem. There is a little .006-ish spacer washer in there that you can take out. It reduces the clearance (due to wear, I assume) between the spinny-part and the magnet-ey part. Now it engages every time and has for a year. Dealer would have replaced the compressor AND charged to evacuate the refrigerant AND charged for new refrigerant. So it was "free", instead of what I have to assume is about $900 or more.
I've also replaced MDS solenoids on a Dodge Charger, water pumps on an old Chevy, found a problem relay on the Kubota (thanks Fred!) glow plug circuit, put a block heater in the Kubota, and a "million" other things. I change my own oil, rotate my own tires, put the snow tires on myself, etc. As my dad says, "It pays to be handy".
Time is of course my enemy. Things just take a while, which can be frustrating sometimes, but so goes it. I'd have a lot less if I didn't save money on the things that I can. My son is 5-1/2 (he'd never forget the 1/2) and he's got a couple years of college in a 529 plan. Should grow nicely. I go to his soccer games (multiple nights a week!) and try to split wood when we get home. Get to bed tired, but satisfied.