Quoted from frenchmarky:I've had 70 pins and fixed them all myself by trial and error and I think I'm really smart but then I see people in here who design entire new replacement MPU boards and can comprehend complex digital electronics or can build their own pinball machine from scratch and it makes me feel like a really ignorant, stupid piker who's just been fiddling around with the hobby for 30 years instead of a veteran.
Don't be too hard on yourself. Some people never learn how to twist two wires together! Others come on here asking if it matters which way around an IC is inserted!
The ones that are designing MPU's and building complete machines are usually electronically trained people.
Electronics is a skill that has to be learned by study - it isn't like lots of mechanical things that can often be learned by observation, rebuilding an engine for example.
I'm not suggesting building an engine is easy or doesn't require any skill, of course it does, but electronics takes a whole different mindset to grasp.