Just Try It
It’s okay not to have the rules memorized when playing a TTRPG
I've been playing and Game Mastering various tabletop RPGs for a long time -- from old school Dungeons and Dragons and Pathfinder, to Wraith the Oblivion, Exalted, and Talislanta. I've run GURPS, Champions, Silver Age Sentinels, Unknown Armies, Conspiracy X, Call of Cthulhu, Earthdawn, Heavy Gear... it's a lot of games.
