New wheels, gears

My new - new to me at least - eBay Mavic wheels arrived today. The cassette, chain and the tools I ordered arrived yesterday. I have way to much to do, so of course I immediately installed the whole mess.
Cassette: Easy.
Chain: Easy on. Whoops, missed threading it through a hidden part of the derailleur. Taking it off, re threading it and reattaching it was a pain. But it's all better now. It's shiny, quiet and shifts like a dream.
Now my Mountain bike is my fine commuter bike, at least in theory. Giddy up!