Discipline is a challenge when playing only one table and very tight. It is tempting to spew when you actually have a (starting) hand because you play so few. I need to be alert to this.

On the positive side the nit play style makes post-flop spew an almost +EV play style as people will give me more credit for hands (in general) if they are the least bit observant and fold more.

On the way in to work I was thinking about Ed Miller's: Getting Started in Hold'em and how one of the first thing he focuses on is learning to read the board - as in determine based on the board what the nuts are in this situation. I think a lesson on board reading might be worth considering, maybe even before this one on playing tight. For every hand look at the board on the flop, determine what is the nuts, second nuts, third nuts - do the same on turn - do the same on river. Regardless if you're playing the hand or not. This is one skill that needs to become automatic (just as checking stack sizes needs to become automatic, but that's a more advanced topic than just reading the board to determine nuts).