Hi Bonsai4life,
I'm by no means an expert (I'm about 3 years into the hobby) and I don't have experience with that particular species, but here's what I'd do:
Assuming that it's a relatively inexpensive piece of material (a holiday tree from a big box store? I've seen them use stone pines for those) and that you are as interested in developing your own skills as you are in developing this particular tree, I'd feel free to style it any time between now and early spring (like mid Feb). I would protect it from any freezing temps after styling if we get any (in a garage, under an awning, or under frost cloth, not in the house). I'm not sure, but I'd guess you'd be okay taking off up to 50% of the foliage?
In terms of actual styling, take a look at some of the nursery stock series from bonsai Mirai on YouTube. Here's one:
If you do style it, I would not repot it until the following year (ie Jan or Feb 2022). Generally, the recommendation is to do no more than one "insult" per year (ie one major operation like styling or repotting per year at most).
Hope that helps, and hope to see you at PBS meetings once they resume!
Andy