How Do You Get Through Hill Training?

In preparation for my upcoming, very first 50K trail race, I am doing some hill training.

I have a crazy visualization I use to help me on the hill.  As I'm going up the hill and gravity starts kicking in (and kicking my butt), I breathe very deeply and I focus on something at the top of the hill.  Usually it is a window in a house, and I focus on the window and picture flying through the window.  Strange, eh?  I don't know why, but it works for me.  It gives me a point to look toward, to keep my head high and my thoughts at the top of the hill instead of on my feet.

How do you get through hill training?