Excellent, Don't sell yourself short when it comes to learning something new. You might be surprised how quickly you pick this up.
Just my opinion, but I believe it does us good no matter what our ages are, to try and experience new things in our lives, and what you are doing is a prime example. Well done.
I personally have not used Fusion 360, but know of chaps that run the full-blown version to design,draw and run 5 Axis Machining centres, they love it. Obtaining things for free is great and I am onboard with doing the very same thing, I don't know what features are missing from the free version, I will be interested to hear how you are progressing in the coming weeks.
I mentioned in my previous post on the software I currently use and have been since 2009.
I went on to the Alibre website and had a poke around, which is something I don't normally do, however I did find a version for personal use called Atom3D. Had I been starting out in 3D modelling, I think it would have been worth considering. As well as free, I do like cheap also
(who doesn't) At $149 US and $50 US yearly support it isn't breaking the bank. The onsite video does provide a good demo. Have fun😊