I hear ya...all I read was negative comments about getting my pup so young... But, she's a healthy, almost 10 week old pup now & doing wonderfully and has consistently used her potty pads since 8 weeks old
I do hear many people with new pups complain about them not eating well. Maybe have some fresh chicken in that you could boil up if you run into a problem the first few days. Hopefully the breeder will give you some of the food that your pup has been eating so it's familiar to her. My breeder did this, but ZoE still wouldn't eat it, so I bought her some Royal Canin Mini Baby dog food as our Vet's recommendation, and she loved that.