Of course professional is the best option. Almost nobody has their ped professionally painted.
Your prep looks good. I let each color coat cure for a couple days and wet sand in between. Don’t rush that.
Clear can get runny real easy.
3 days is a joke. Let that stuff sit for a month to cure. If you put anything against it before then, it will deform/imprint the paint. Possibly stick and pull paint off.
Unless you have a way to accelerate the curing.