DIY is taboo here, but I think half the reason is that people ask for DIY help here often make it plain they have no business opening a service panel with or without help from the way or type of questions they ask.
I'm just another consumer, but my screwdriver is often much braver than it should be. HVAC is full of little tricks that can mess up even experienced guys, so caution may be the smartest route.
Don't worry too much about the "rules", they will shoot me first I am sure.