First: read the tutorials, read the tutorials, read the tutorials
Second: just play with it - get a feel for the controls in ALL the different view modes. Know what each of the program features do.
Third: Don't stretch yourself too far too fast - you don't want to get disappointed before you really get going. Although the learning curve is not that steep, look at the coasters others have created as "how to" examples.
From a personal perspective, and yes it is only my opinion, the program is very enjoyable and relatively easy to work with, but then again it's just what I got used to first.