Single/flush Shore Pine

Its now mid august – I bought a Shore pine in early july. Did a slight pruning in July. All of this years growth was still elongating/growing. Now they harden off.
My question:

  1. Can I prune back the new growth for defining the shape of the tree now ?
  2. Will at this time,-- allow budding for spring growth ?
  3. Can I clean interior needles now?
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