I'm interested in how you adjust that for expertise; do you bump your hourly rate for items that took you longer to learn to make well? How do you figure out how much to bump by, if you do?
Nope, my hourly rate is my hourly rate. If something takes more time, it simply costs more.
I was trying to ask about things where it took you a certain amount of time upfront to learn to make it well, but once that's done, it only takes you a small amount of time to make each individual piece. I think this sort of thing was asked elsewhere, basically how do you account for "R&D" and expertise-building in your hourly rate.
Ahh, I see. I take classes and practice on my own time.