Sounds like you have got everything thing planned, well done.
You are right, some universities are really competitive with about 8% of applicants getting offers, others it can be as high as 40%, but don't forget a lot of students aren't nearly as prepared as you. You first big step now is getting your personal statement ready, my recommendation would be to write it, go away, read it, rewrite it, ask your tutor to read it and then rewrite it. If you can get through to interview stage you sound like the kind of person who will get through that stage easily.
With your Access course, three handy tips, firstly reference everything, secondly to make your assignments look professional you can include diagrams off the internet (just reference them to reliable sites (like BBC or gov) and thirdly if you ever have spare words left when writing your assignment then it means that you have missed something obvious.
I'm very excited for you starting off because today I am officially enrolling at university today 😎 it feels so surreal, hopefully I will pick up my nurses uniform today too