I'd wait til Spring or early summer as trimming now may result in brown edges on the shoots. The main thing to remember with conifers is that they may not sprout from brown wood, so just lightly trim off the green soft growth to maintain the shape. Of course, you can prune off any shoots that grow that aren't part of the 'lollipop' part.

Do it slowly till you get the hang of it, keep stopping and standing back and walk around it to see that you are keeping the shape you want, better to take off too little than too much. I wouldnt use shears either.

Thanks very much for the kind advise, snow has changed
shape !!

It should be okay as it grows TG if it snows hard again you might want to gently brush it off.