If it's just a hobby, you're better off playing in a card room. It's much more fun and if you lose a buyin or two, go home and come back next weekend.

Something else to consider:
If you really want to know how good you are at poker, you have to do it over tens or hundreds of thousands of hands.
-bankroll required-
Thinking about it in terms of big bets rather than cash like Hawkfan said is a good idea also.