However in lieu of this, I offer the way it was taught to me. Apologies to those for whom this is old hat, and also for the paucity of my verbal explanations. Pictures would help but, as always, the best bet is to find someone to show you. Leave the inner bead. If after placing the first tyre lever you are unable to fit another in because the tension in the bead is too great then relax the first, slip the second in and use both together.
Many people like to cover the tube in copious quantities of talcum powder first.
Begin replacing the outer bead by hand. Start about 90 degrees away from the valve and work towards it. In the latter case, you will have to resort to using tyre levers and your mileage may vary. Go round the entire wheel, pinching the tyre in with your fingers to check that there is no tube trapped beneath the rim. If you have trapped the tube, deduct ten marks and go back to step one.