When I got it, just before Christmas, I pretty much dominated the Trainer my dad got and I could only close the #1 about three times or so. What I did was I'd set up and really do one quality effort, i.e. I'd stand, clamp my elbow to my hip bone and squeeze my glutes to make as powerful a grip as I could. Then I did the same thing with the other arm. Then I would chill out and try not to touch the thing for at least an hour. Then I'd do it again. One quality effort at a time. I figured one good attempt that resulted in solidly closing it was better for it and me then limp dicking it with mulitple half efforts.
Naturally, some days I play with it alot more then others, because I quickly discovered my grip strength starts to give out if I play with it too much too frequently. I'm a fan of CW's stuff and think it's better to do a little bit at a time with higher frequency.
Now, three weeks to the day (I think...) since I got it I can close it about ten times with my right and less with my left, like five.
I'd like to start working with a #2 pretty soon.
At home I have a short piece of railroad track I did hammer curls with and a loadable dumbell handle I would hold by a thick end to do leverage bar work with. I also made my own poor man's Eagle Loops out of rope, which I mostly use to hand from my chinning bar by my fingers. That, and deadlifting without straps is pretty much the extent of my grip training.
Hope that wasn't too much detail...