Starfinder 2E might be a bit easier because you're at the start of the cycle, rather than after several big books and a whole remaster. Might help you get over the hump of learning/knowing things by not feeling like you have a whole bunch of "homework", but are starting with everyone else.
I would say that it's also one of those very hard mental blocks to get over that I had for a long time (and still kind of do), where you feel like you have to know all the rules at any given time. Sometimes you roll with things if you can't find it quick and inform everyone that you'll look it up in the future. That might not fly with certain groups, but it does with mine.