Depending upon the unit and elevation you are hunting in Colo it can be 80 degrees one day and -20 the next. Be prepared for the worse conditions...snow, sleet, rain, etc and you ought to be ok? I'd bring along 4 sets of tire chains if you are going to be in muddy country. Good snow boots, light hikers, gators, layers of clothes. You never know what weather you will run into that time of year so be prepared!
You likely won't hear 1 bull bugle so you'll need to cover quite a bit of country to find the bachelor groups of bulls. Some bulls may still be with a few cows but most will be off by themselves. Definitely get away from the crowds of hunters...especially if you are hunting a general unit. General units can be a zoo so be prepared for company...even in remote areas! Good luck!