Firstly, you gotta look like this:
Then, get someone else who looks like that to help you. Whilst they hold one side of the tyre in the rim, you start at one side of the wheel, teasing the other side of the tyre into the rim. Get your helper to hold these in place.
Now work your way round the wheel. Get as far as you can by brute strength alone, but eventually you and your mate will be in a giggling fit, breaking wind through exertion, and looking like you are doing some dubious Twister variant. At this point, engage the use of a VAR lever to finish the job.
Simple - what's all the fuss about?