1 & 3 good videos!!
Waiting for 2.
Feedback: might drop a shop rag over the battery.
A hand mirror will help check the holes on the sprocket.
I use a few drops of gear oil on the moving parts before replacing valve cover.....the heavy gear oil tends to not drip off so quickly.(haven't seen 2 yet...maybe you already did this.
Small #2 philips driver bit in a small ratchet might get to that awkward panel screw...but a right angle screw driver is a good tool for the underseat.
Overall, good job for you first valve rodeo!
Stig