To get yourself up to speed with CQC, you will want to go through a few different steps. Though CQC is a large product, at its roots it really only has a few really fundamental concepts. The complexity comes in more because of the open ended ways that these concepts can be applied. Unlike simpler, more limited products that provide a template for you to fill in, with CQC you are presented with a blank slate and are able to create almost any solution you want. The cost of flexibility is that there's often a period of overload until the light finally comes on and you see the big picture.
The steps you will want to take are:
The tutorial videos use a device simulator, so you don't have to hook up any actual real devices to CQC in order to go through them. That means you could do it on an airplane if you wanted something to do a little more fun than eating peanuts and hoping you don't crash. The product has a 30 day, unencumbered trial period for you go through the tutorials. When you are done and have decided to move forward with your actual implementation, you can generally just run the uninstaller and remove that version and re-install it where you really want it to live long term. If you already have it where you want it, and you have work that you don't want to lose, then you can just license the copy you already have installed.