I'll echo what excellent advice @HAWK has already provided. You'll find that our Get Started book really is targeted at someone like yourself, and answers a bunch of questions about how to a) identify the gaps in your skill set, and b) how to fill in those gaps. At the crux of that, as mentioned already, is getting a portfolio together, and there's no shortcut here. You just need to do the work to be able to talk about it. Whether that's a hypothetical project, or a personal project, or a pro-bono project, pick something and start unpacking the problem and how you might be able to improve it. What's important when you approach employers is not what the end product looks like, but how you arrived at it. What did you learn? Why did you make certain decisions? What did you get right off the bat, and what was based on false assumptions that you were forced to change tack down the track.
You have been given plenty of material (courses, books, articles) to consume, and I encourage you to learn as much as possible from these. But you still also need to apply what you learn to get runs on the board, otherwise you'll be full of theory and be missing the experience that employers are looking for.
Good luck! You're in good hands here, so please make sure you check in for guidance and keep us updated! You'll probably be surprised just how much you can apply from what you've learned in nursing (especially if you decide to specialise in the exciting and burgeoning field of UX for health industry). I wish you all the best.