I want to be self-sufficient enough to “own” my machine (i.e. to be able to repair it myself). OTOH, I see lots of room for user error judging from the service manual steps with difficult measurements. It seems I have a good chance of making it worse by adjusting something that doesn’t need it. I doubt I’ll be able to find a pro who I can watch over the shoulder on in my area, so the risk of making it worse might be my best option.