Inventor Tutorial Program

[cooker52]

As everyone else has been saying, spend some time getting familiar with the controls of Inventor. Spend a few days, if not a week playing around with it.

The way I learned was from a mentor, then working on CAD files for last years robot. I also learned some more of its features through the tutorials in the Help menu.
But, the most I've learned about it has been on my own, with playing around in it. Once you get the basics and with a little bit of time, you can learn tons.