DIY ductwork repair does not go as planned

The ductwork in this old house is very old, leaks, and is rusted out is spots. It must be one of the first central HVAC units ever installed. We knew that the ductwork needed replacing before we bought the house but I didn’t think it was that big of a deal. After all, how hard is it to change out a few ducts? I did a bit a of research and found out that I needed a sheet metal bender and cutter. No problem. The local hardware store rents these out. I got the metal, I got the cutter and the bender, and I got the duct sealant. I thought I was ready to go. Well, 4 days later and I have only got ductwork up for 1 room of the house. Despite this, I have gone through nearly all of the sheet metal I purchased because I keep making mistakes. The sheet metal is expensive and so is renting the tools for so many days. If I were to buy more sheet metal, I would have spent more money than it would have cost me to just have the HVAC professionals replace the ductwork for me. That is why I decided to fold my cards and call an HVAC company then return the tools to the hardware store. I explained everything to the HVAC technician and he was nice enough not to laugh at my amateur attempt. Instead, he got right to work and had all of my ductwork up in a day. He made it look so easy but I know, from experience, that it is really not.

Cooling expert