when i did community service at a greenhouse in my teens (bwahaha), i learned you skip a node when pruning. 1 node, 2nd node - cut above. 1-2-cut above. etc..
It's probably safer to wait for 6-7 nodes before you start cutting your plant, though. You never want to take off more than 1/3rd of your plant at a time. Greater chance of shocking it and stalled growth for a period of time that can last a while in some cases.