What is the proper way to trim a hanging tomato plant?

I have a tomato post with over-hanging vines; as the tomatoes get ripe, I pick them. The vines are getting too long though. What is the correct way to trim them without damaging or killing the plant?

What is the proper way to trim a hanging tomato plant?
Trim some all the way back to the main, vertical branch to thin them out and for larger fruit; and trim some of the branches back to the next closest flower. Also cut off any browned or damaged leaves. I like to cut the bottom branches off also so that they are not resting on the soil......

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