If you are going to the other dogs house and bringing your dog there to meet it might not go as well as it could. Maybe suggest a park or something so it isn't a safe place for one dog and not the other.
I went with my daughter to a shelter to pick out a dog and we wanted it to play with my dog, at the shelter they didn't play with each other in fact there was growling. Now they are best of friends and when they get together they run and play until they can't move.
Best of luck I'm sure all will go well and you will have a new addition to the family.