If you're not confident in your abilities, I'd stay away from shorthanded tables. It's true that playing about looser is correct when you have fewer opponents, but that doesn't necessarily mean that you should play ALL hands more loosely. The problem with being an inexperienced player at a shorthanded table is that you get to make mistakes much more often, and a player who knows what he's doing will eat you up.
I'd find a full table, stick with the top 20 starting hands, and play them strongly. Once the discipline is learned, move on to learning situational play, and eventually maybe move back to shorthanded, armed with the knowledge of which hands work when and how they should be played.