i start opposite the valve for removal and work both sides round to the valve, by the time you get there its normally already off. make sure bead is broken both sides and tyre in the wheel well, this give you maximum slack.
start at the valve when fitting and make sure the harder bit around the valve is in the tyre and not squashed by the bead.
use good tyre irons not spoons, and a good soap on the tyre when refitting makes life easier. some say dont use washing up liquid and the chemicals in it can corrode alloy rims, likewise wd40 may speed up perishing of tube.
if you can, work on the opposite side to the sprocket. 2 reasons, 1 you wont warp the disc by leaning on it and 2 you wont beat your knuckles to death on an oiley sprocket.
most important dont rush, theres nothing worse than changing a tyre and pinching the tube.