It's surprisingly easy, fwiw.
Can you have the 21 walk you through it?
When I was first driving, the owner of the local gas station was in love with my mom and treated us like royalty so I didn't pump gas for a few years. I thought I'd hate it. But it's not that hard. Gas pump handles are a lot cleaner and nicer than they used to be.
But Tampa to MCO isnt that far, and I'd totally pay 5ish per gallon for a few gallons to National or
Alamo or whatever company to not deal with the relative hassle, in your shoes.