Hi Georgie! What kind of things do you want to learn in AutoCAD? For my case, I have projects on the job that totally push me to get to know AutoCAD functions better. I think a tangible and motivating set of data to play with is a fundamental requirement to overcome any frustration.
In my case, since the river data I am playing with will eventually contribute to minimizing flood problems on the area I studied, I am motivated to rise to the occasion. I also get those free tutorials. Autodesk is chock full of those video and text tutorials.