I own 2 MS251 chainsaws, BR550 backpack blower, SH86 shredder/blower, FS110R line trimmer. 2 Troybilt law mowers, Troybilt 2410 snow thrower, Earthquake chipper shredder. I usually do all my own maintenance and repair. I even do vehicle maintenance and repair as needed.
My first engine overhaul was when I was in High School and my dad said go ahead and overhaul our mower. So without having a manual or Youtube, and having just tools, to took the Clinton engine apart, carefully putting the parts in several small cardboard boxes. My dad looked at what I had done and later brought home new parts to go into the engine. I reassembled it and it worked perfectly and with lots more power. That i s how I stated in small engine repair.