Shagrathanswered grow question 5 years ago HI!
Topping is the most easiest thing to do and it does not matter how you do it. I prefer to use scissors and I just cut the stem above the nodes I want to make my new mains. Usually I wait until 5-6 nodes have grown and I cut between 3rd and 4th node to make the 3rd nodes my new mains. I always leave some stem above the nodes so I don't have to be that careful with the scissors. You can check my diaries to get a better hold on things. But don't stress about it, its hard to fail topping