A couple of tips.
2 quarts of POR15 was about $100 from my local auto paint store. It gave me two coats. I could have gotten a gallon for about $30 more. I would be careful with coating too much. I used the existing angle strips and the fit was very tight.
A creeper would be very useful! I didn't have one, and wished I did.
I did not remove the bed. It would have been easier, but it was not terrible leaving it on.