Right now I'm playing 100NL and 200NL.

You might be thinking....huh? This guy can't even beat 50NL.

I'm almost certainly beating the games I'm playing at right now.

First the skill difference of the average player between 50NL and 200NL seems to be way smaller than I thought.

Combine that fact with the fact that I'm practicing very stingy game selection over both 100NL and 200NL. I pick the 4 juiciest tables over 2 levels, not just 1. It gives me a huge advantage in game selection.

So huge, I would say my winrate might be higher than just playing 100NL exclusively.

Combine that with the fact that I've gotten better in general at thinking in poker from playing heads up.

I'm still not great. But I think practicing very solid game selection, playing only 4 tables max, and really focusing on the game results in teh moneys. I don't have any sort of sample size to prove this, but I think you should know when you are beating the game if you've played enough poker.