How easy is this? I'm particularly want to clean my cassette and rear mech as they have gotten quite grim, and I can't seem to be able to clean them properly when they are still attached to the bike. Thought I could perhaps grease the hub while I'm at it. Also with the cassette off I take it the chain can be taken off and given a good clean (Sheldon shake jobbie) at the same time? I've got the Lidl tool kit, Haynes Manual and links to Alex's Bicycle tutor etc so I'm up for giving it a go.