Well, I'm a nurse and I have found it really useful in smallholding. So don't do yourself down!
Nursing means that you are good at nurturing, which is useful when you are looking after animals. I'm sure it's good for fruit and veg as well. It means you don't panic when an animal is injured, and you have half an idea what to do if you have to tube a lamb or inject a sheep. (Although admittedly, the anatomy is a bit different
)
As for what to read, the diary pages of this website are invaluable. I read all of them before I started looking for small holding. Also, Country Smallholding magazine and anything by John Seymour.
I live near Taunton, so you are welcome to come and have a chat if you want.