I would suggest doing it yourself if you have the knowledge and skills to complete the job, the one thing I will state is that if any issues arise (if installation is done improperly) it could cause further issues and injury. For this reason I would always suggest a home owner contact an insured and licensed heating installation company to get the job done correctly. In theory saving money always sounds great but could always have the potential to go wrong...
-Best of Luck
Believe me, I get that...and that was exactly what I had planned on from the get-go. There are so many horror stories out there about shoddy installations out there, and the fact that mine is going to be pretty straight forward led me toward considering doing the work myself.
Asking honestly here: these high-end class A systems have very good locking together mechanisms, and if I maintain and exceed all required clearances, adhere to code for radiation shielding, supports, etc, what should make me shy away from doing the work myself?