When am I ready to move up to 2/4?

[Grease]

It's been a while since I've played 1/2, but I remember the difference between 1/2 and 2/4 to be small.

I would recommend staying at 1/2 for another 5k hands or so until you reread SSH a few more times, and it certainly doesn't hurt to stay low.

I just think you're in danger of your bankroll increasing faster than your skill.

I think you'll be fine at 2/4, it would just help to play a little longer at a lower level to plug any leaks.