I just put marathon pluses on my commuter and they have a reputation for being tough. I (mostly) followed the instructions at Spa cycles
http://www.spacycles.co.uk/index.php
Perhaps this method will work with Gators too?
Last night I had to put two new tyres on my good bike and another one on my ribble. All gatorskins. I used the advice in this video. I have to say this is the first time I've ever managed to put tyres on just with my fingers. I've been doing it wrong all this time. Brilliant. 3 in one night.