I did the fireplace mantel and dining room chair rail last year. Over the holidays (you can see the Christmas tree in the background), I started tackling the stairs (which need a total makeover but that's a big project) and the divider wall between the kitchen and family room.
Here are some before and during photos as I taped and applied the primer.
And the after. Ah, much better!!!
Here you can see both done in one photo: