When I can, I chop in three stages. My top buds get ready first, so I take the top 1/3 of each limb. {the budded part of the limb anyway} Then a week later I take half of what is left. A week after that, I clean up everything else.
But if you have a few lower buds that look ready, go ahead and clip a couple. You will get a preview of what is to come.