That tends to be what I did / do also. I only do bits and pieces for a few cherry picked clients now one of which pays me a retainer but I just do it out of hours normally. Its brilliant through Google remote desktop. I just login from the van or where ever and see a list of all their computers, click on one, put the pin and away you go. The only issue these days is people have got greedy with their screens and some of them have three monitors. That can take some getting around and faffing when your connecting with a 15" laptop.
Used all sorts in the past. Teamviewer (very good but you need to pay for it and its expensive), Logmein (the same), Remote desktop (never got on with that one), Any desk (good for a quick one time session) and of course the one that anyone can use Microsoft Quick Assist. Quick assist is clunky but the one good thing about it is that its already installed in all Windows 10 and 11 machines so if you ever need to help someone on the fly just use that.