I don't know if this will help but make sure you have one long tyre lever, about 12inches is normally good enough. The second lever can be small and you use this to hold the tire to prevent it from slipping back. The long lever you use for the hard work to lever with and once the tyre is over the rim put the small right next to the big one and move the big one up about two inches and repeat the process.
To get the bead of the rim into the centre, I find using the levers is useless.
The technique I use is to place the wheel flat on the ground or floor with something to protect the rim and hub like a rag or piece of cardboard. I then use my 100+kilo body weight to step on the side of the tire and sometimes you need to rock your body weight to increase the pressure but I have always been very successful doing it in this way.
For the lightweights I guess the only advice I have is that you have to eat your porridge in the morning.
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