Outside of the computer related issues, a lot of repairs just take comment sense. A good exploded view, a schematic (wiring, plumbing, pneumatic, hydraulic, etc. ) will get me down the road on 75% of repairs. I also tend to have a pretty good feel for what I can do and what should be left for the professionals.
When you have worked on enough different items, some of it is just second nature. Critical things to be aware of:
1. Patience. Patience. Patience.
2. Right tools. Sometimes there is no substitute for the right tool. Sometimes you can make a special tool work. If I remember right, it was my 2009 Wranger, changing the passenger side spark plug closest to the firewall required an extension that was shorter than any I had in my toolbox. Probably shorter than are made, period. But my 3/8" to 1/4" and 1/4" to 3/8" adapters mated together was just the right length.
3. Clean: I was trained by a guy in a machine shop who would spend 2 hours cleaning a machine, an hour setting the block of metal in the mill, and 3 minutes making the cut he needed to make on the mill. Guess he really tied my #1 with my #3 rules in his work.
I did find this thread, the utube video is almost useless but did help with 1/2 of my questions regarding the coil packs.
I am a little worried about how much removal is required on the intake. Guess one Saturday morning I will remove that plastic engine cover and poke around a bit.
Didn't find much in line with spark plug change that helps, partially because for some reason, none of the utube videos I find have any audio.
Oh, and don't ever hand me a paint brush. Which end do use, I always forget.