Go for it! Learning as an adult is surprisingly easy -- don't think you are desperately disadvantaged by your age. Actually, adult learners do remarkably well at academic courses. I guess it is about being better able to identify what matters, to focus, and to stick to things.
You need to use a method that works for you -- some people can really only learn from other people, some people can learn from standard textbooks. Good self-paced materials are great, but you have to find one with your sort of pace. So think about what has worked for you in the past, and look around you now. If what you are trying doesn't work, try something else.
And try to control a yearning for perfection -- you don't need a deep understanding of every detail, Good enough is good enough. Whichever bits you actually need in your career will get developed fully then.