If you can read, you can install most heating equipment. The instructions come with the piece of equipment. Just read and do what they say!All of that said, I have learned over the last year of my build that installing most of these systems really isn't rocket science, regardless of the trade.
I hold trained, licensed tradesmen in the highest regard. I also understand that I am probably as smart as the average bear, am ****, and can to follow directions and/or codes, therefore I can complete most any installation to spec and pass any inspection. Sometimes it seems tradespeople cast all DIY'ers as morons, and proclaim that their industry is just so complex that the homeowner couldn't possibly DIY things without causing massive calamity. It has been my experience that this usually isn't true.
The major difference is, I'd never make ANY money commercially since it takes me so much longer than a skilled, trained, licensed tradesman.
Now, granted, there is some odd install that isn't covered in the book and this is where and experienced installer that is familiar with codes wins out. He can look at the situation and come up with some result that is not in the install manual that meets code.
When I ran a service department install guys would call me and ask me about some situation I knew was in the manual. I would ask them if they have read the install manual and if the answer was no, I told them to read it, then get back with me and hang up the phone. I pounded it into them that I expected them to read the manual and will never give them any **** about sitting down on the job and reading. I told them thy will get **** if they call me and haven't read the install manual.
It was funny, I hired a new kid and the first day we were sitting in my office getting ready to go for the day and one of the guys that has been there a while tells the new guy, "If you haven't read the manual, don't call for help, don't even think about it!!"