yes, dissecting a motor was the second class....it was a brand new or rather never used motor. We took turns taking it off parts. I watched a more experienced guy with a whole lot more tools than I use the compression ring tool etc.
third class we did the same with a two cycle engine.
Primarily I am learning from others and their stories. One guy puts screws and bolts from one piece into a ziplock. Another photographs often during breakdown to recall placement.
I have a retired navy lady doing small engine repair over the next block and I stopped in and spoke with her about fuel lines. She showed me her formica sketch pad.
I am half way through the course and troubleshooting is next week. Maybe taking this as my project piece.