Caeln and I replaced the lights over the mantle in the living room. The transformer for the old lights died a few years ago and we finally got around to putting in the new track lights. Currently running 50W Halogens, but some 35W equivalent 45 degree warm white dimable LED bulbs are on their way.
Working on this side of the fireplace in the attic involves worming through a space not much bigger than I am. It does help that I've lost 35lbs since the last time I tried this.
Maybe next weekend we'll work on installing some mantle lights on the kitchen side. We'll need to be more careful about cutting the hole for the box as the track lights won't be hidden around a beam as they are in the livingroom.