Sprocket Changing Instructions
Clean and lube the Chain while you're here
Heck, you're this far already, might as well wipe the chain down and apply some new lube.
I use the Maxim Chain Wax. I put a paper behind it when I spray so it doesn't make a mess. I spray about a foot at a time then rotate the rear wheel and do another foot, repeat until saturated.
On to the next step.