Funny thing! In 1985 when I watched Efren doing things that the rest of the field couldn't even approach. That was at the Sands in Reno.
I did my research and found Billiards well right after Rotation. With the knowledge that Billiards Digest had named Willie Hoppe player of the century, it seemed basic to read his book.

While my table had holes it was simple enough to practice and to a degree pick up what he was laying down.

As for how good do I play? Reminds me of the scene from The Hustler. Showing up to find the table has no pockets. If we can make a game, I will play for everything I have in my pockets. Harry used to make the team empty their pockets to establish the stakes in the one pocket.
Today I have 600 and change......you wanna play some?