Not because it's technically difficult — because you have to decide something is worth money and say so out loud. Everything after that is repetition.
A title, a price and a file. That's a store.
The link works in a comment or a DM as well as a bio.
Views and buyers tell you whether it was price or page.
Free plan keeps your link page; selling starts on a paid plan with a trial.

0%
platform fee on any plan
~1 min
to claim a link and publish
10
product types on one page