If you have a fairly well developed scots pine, pay attention. Mid-summer is a good time to do any pruning you still may have to do on the tree, as it encourages development of shorter branchlets and helps with budding along the branch.
0:00 Main steps for summer pruning of pine
1:10 When do you prune pine in summer?
1:44 How far can you prune Pine bonsai?
3:30 You should start pruning at the top
3:49 Do not pluck needles
5:15 Warning: Prune then thin
6:00 Why thin needles on Pine
6:40 Why prune pine candles?
8:35 Example. This is what we are after
8:53 Tree development stage for pruning
9:44 Mistakes happen
10:38 Tips for thinning Pine needles
11:00 Pine bonsai pruning process combined