I’m not going to say it’s a job everyone should attempt or do but man Dont charge someone 300.00 to remove less than one 1/8 inch of material. I would feel guilty charging 80.00 to do that but it has to be worth your while.
Shoot, before I retired it would cost 75 just for me to show up and discuss what the person wanted.
300 for 1.5 hrs of experienced and proven labor is nothing.