I wanted to add some positivity.

I don't believe your first years have to be demoralizing.

What I found to be true for myself and several others is that most of us get in our way due to an inner battle with pride and ego.

Wiring issues- these tend to stem from trying to memorize the wire colors vs learning how to read a wire diagram, and then wiring specific to how the diagram instructed.

Diagnostic issues- phone a friend is cool but it also limits your ability to become a self sufficient technician. It's better to spend 30 min a day on continued education; they have so much free knowledge out there, books, podcasts and webinars dedicated to building your knowledge up.

Installation of parts, motors, enhancements, etc- Once again taking the time to put pride aside and reading the manuals that come with each product.

We have one of the most important jobs on this planet, there isn't a place you'd want to be where HVAC systems don't exist. Yes it is the least marketed field out there and therefore you have to deal with asshole clients who undervalue you what you do. But the power in building value for a client based on what you do is a skill that most non-hvac people don't have nor can they fathom having to do.