Check out CoCreate's free version of their 3D CAD. It's not history-based so it might be a bit easier to use. There are some good tutorials that you can get for it too. You can do a lot with the free version. It doesn't expire or anything - but I am sure they will call you and try to sell it to you the full version. CoCreate 3rd-Generation PLM and History-Free CAD Software. Some of the other CAD companies offer free too, but it usually expires or is stripped.

Paul