Some tires are easy, some suck. My Paselas all go on fairly easily, the Clements I just did were a PITA.

One thing I find makes it easier is starting 180 degrees from the valve stem. The tube seems to be a bit stiffer around that, making it just that much harder if you are ending around it. Sometimes I have to let out a bit of pressure when I get near the end, too.

FWIW, don't use tire levers to install, if you have a particularly problematic one you can use a tire jack (skip to 1:00 if you don't want to watch overdramatic struggling)