I don’t think you need to worry. Consensus is that pf2e is actually easier to run than 5e. There might be more rules, but they work and you don’t need to make shit up to make it work.

My DM recently ran the Beginner Box for our group.

Was a lot of fun, and is specifically geared at learning the rules.

We messed it up and botched a few things here and there trying to push the rules, but went in with the zero consequences mindset and had a blast.

Hope you get to run it soon!

Edit: I also highly recommend this character builder if you’re going to use R20 to run Pathfinder — R20s charactermancer was a bit limiting, at least when we played ~3-4 months ago.