I am really interested in learning how to use SolidWorks.

My background is 3D modeling in SketchUp and 2D in AutoCAD, but with projects coming up that need to be 3D printed, I am hearing more and more that SolidWorks is the goto model producer for 3D output. I just can not afford the cost. But I'm hoping some kind of opportunity will come along. Meanwhile, I would like to learn all I can. So are there some very basic, "This is where you start" types of lessons that I could be learning from now, while I wait and hope?