I would let it grow until late summer, then prun back to buds. If you don't see a bud on the branch, you can loose a branch if all it has is a few needles. It needs an already formed bud to cut back to. No buds, often the branch will die.
Corollary: Growth out at the ends of branches causes buds to form in the interior. You need growth to get back buds. Let it grow, then cut back.