Good overall tutorial on the process. I do mine essentially the same way. I do it where I park it on gravel.. Big piece of cardboard under the axle and my foam pad squares saves the knees!
I don't do any of that measuring stuff.. I don't use that packing tool.. I have one. Used it once. Just do the palm method and works great.
When I adjust the brakes I use the manual adjuster from the rear and get it to a point where it has drag and then back off a tick or two so that I just hear it scraping, but can still rotate a couple of turns with a good spin.
For setting the nut, I like to turn it tight while turning the drum then back off and then hand tight to where the cotter pin goes thru. As long as there is no play in the drum to the spindle, it's good..
๐Been doing that on wheel bearings since I was a kid doing them on the family car back in the 80's.
My current trailer has the self adjusting brakes and the zerk on the front and I've done that last year, but I'll probably pull them before this camping season, just to look at the new setup.
Good luck! Mitch
2013 F150 XLT 4x4 SuperCab Max Tow Egoboost 3.73 gears #7700 GVWR #1920 payload. 2019 Rockwood Mini Lite 2511S.