Thank you both so much you both where very helpful
You'll be fine! All first-time Mums have the same concerns as you, it will get better once you have a routine established and simply as time goes by.
With her nails, cut them in her sleep or get her scratching mittens to cover them, that way her hands and fingers remain warm.
Try some lanolin or lanosil on your nipples, it is not harmful to your baby, is a natural product which is great for sore or chapped nipples.
Wait until she is asleep to cute her nails. And my nipple's did the same thing. And they told me I could still breast feed.