Check some of the guides here for sure. You may as well wait until there is more leaves, so the plant doesn't have to replace a larger percentage of it's foliage. Have you considered the FIM technique? Very low stress, easy on young plants. Or better yet, don't hack away at your plant as it's growing! Pruning is completely unnecessary and the plant will be happier. Tie the top of the plant down low, bending the plant sideways, and you will achieve the same goal as pruning. The only time I ever prune is if a leaf has bugs, is dead, or if I'm growing sea of green but that's a whole 'nother story...