Materials cost us a lot less than $100, but it took us 8 hrs x 3 people.
We did it before the Urethane became rock hard.
It's the labor time that costs the $$$ if you have a pro do it.
If the paint has cured/totally-hardened, I'd have a pro do it, or leave it like it is. The original paint job was not buffed/polished.
Labor rate here is 43.00 a hr. Compared to a garage that's cheap,but that is all our local body shops can get from insurance company's , 24 hrs times 43 is $1032. Plus tax and materials. This sounds like a lot to me,but reality is they have to make a living ,and keep the doors open. Then I have to ask myself ,would I do it for ,what it cost? Sometimes I will and sometimes not.