You have to get the bead down in the well of the rim- or next time you may damage the rim instead of the levers. And that is all the way round the bead aswell. I have Aksiums and although not easy- they are not that hard to change tyres and I use PR2's and Lithions.

And Make of tyre levers is important. I no longer use Park tools levers (The blue ones) as they are too flexible. Bendy levers do make it impossible to remove a tight tyre.