Yep, it's an 8mm socket on the chain adjusters. Just cleaned and adjusted my chain.
Inspect the speedo gear on the front wheel. I don't know how many miles you have on your bike, but packing some grease on the gear is a good idea from time to time. Same goes for the axles and spacers. Everytime I take a wheel off, I clean and regrease the axles and spacers.
Since you're taking off both wheels, I'd do the rear first and then the front. Taking off the front first might cause the back end to tip. And make sure you strap your bike to the jack first.
