Be sure to understand the calibration process, and resist the temptation so skip warming the trainer up fully. It's the only way to get consistent results. They cover it pretty well in the manual, except that you should be fine with a calibration number between 2.1 and 2.5, as long as your tire doesn't slip. I think they give a chart in the manual about expected grades and corresponding calibration numbers, but in their forum they seem to say that the higher numbers aren't really necessary as long as your tire doesn't slip.
Go get some ergvideos (ergvideo.com). They work with the ergo mode, and they give you something to interact with when you're training.
Have fun!
Steve