Yes...it's winter I know. But this just seemed like good info.
Enjoy!
Use the tip of the shear not the entire blade and make the cut level and clean at the neck above last years needles.
Timing for this work is important. Growing season length and the size of the tree are key variables. Do it earlier in cooler climates and for larger trees....do it later for shohin or for warmer climates. In indianapolis for shohin I usually decandle in early to mid June. Although this past years cold cloudy and rainy summer left me with runty needles.
Leave a little stub of this years shoot for strong areas....cut flush in the rest of the areas. This tricks the tree into thinking the shoot is sti there and buds will form a little later in the strong areas. They will form faster in the weak/medium areas in response to having te entire shoot removed.
I usually pluck in mid to late winter...simply because I have more time available for this task. But really it can be done anytime. Below is the technique.