Congradulations on your upcoming puppy.
I know what you mean when you say you feel a little nervous taking care of a puppy. With our family dog, we would all take turns walking her, bathing her and taking her to the vet. Now with Twinkie (13weeks) its only ME!!! But you ll see that it is not that hard and the little furbaby will love you even more knowing you are there for her/him and taking care of her needs.
I wish you all the luck in the world.
Post pictures when you get her/him and welcome to the club!!!