I wear almost nothing on top (just a base layer and maybe an UnderArmor top or fleece vest when really cold) while walking in. I put everything in my pack and dress when close to my tree. I'll even keep the hat in my pack while walking. Your body will heat up despite what you think. Once you do get dressed, layers! Multiple think layers much better than a single bulky layer.

Walk slow. My son realized the hard way that he needs to slow down when walking because he gets too warm. Warm = perspiration, which results in getting cold!

Fleece cover layer is awesome!

The hand warmers are great. I personally don't care for them bunched under my toes so I use the style that is a flat insole inside my boots. Very nice!

If you're less than happy with your boots I suggest a pair of the Artic Shield Boot Covers. Search Cabelas, Bass Pro, etc. This style is think but adds 10-15 degrees of warmth in my opinion.