You're probably safe to do a little pruning still on your Norway spruce as you're a little more north than we are here in central Illinois. However, I would avoid pruning if the sap is running (you'll know after making a few pruning cuts if the sap is flowing).
Don't use any dressing, pruning paint, etc. -- leave bare to allow proper compartmentalization and callus tissue formation post pruning.
Best of luck!