HikeDiveExploreEngineerGirl,I paid an insulation company to do. I drove it to their huge shop. They put a 18-20ish kid with an attitude on the job. He had no concept of even application and thought he was the boss. I made him redo areas where bare metal was still showing.

As a result, it was extra thick in some areas, which required me to do a lot of shaving on it when it hardened/set up. Other areas were too shallow. I had to use Tuff Stuff in a can to bring some areas up.
Real pros do it right, evenly and treat their customers with respect.
I'd do it myself if I were to do it again, now that the commercial tanks are available directly to consumers, not just to insulation companies.
(Wear a disposable Tyvek suit and gloves. The kid that did mine wore old Levies and a plaid cotton shirt with logger boots. He ended up wearing some foam on his boots, pants, hair and shirt. He wasn't very accurate with the applicator gun.)
My goal...
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...is to live in a trailer.