I've followed this site off and on for many years.
I first started out in HVAC in 1991. I have enjoyed working in the industry. My experience is primarily residential but I have also worked light commercial hvac and refrigeration. I believe to be good at what you do, you have to have passion for it. You have to love problem solving and not get frustrated. After all, we are in the repair business and another persons problem is our challenge.
When I started out, I was overwhelmed with the vast amount of knowledge needed to do a job properly. With over 20 years experience now, I still realize I do not know everything and learn new things everyday. But through forums such as this, I may be able to answer some questions for others as well as pick up a few new ideas for myself.