Yes ideally you should wait at least a week before handling. Preferably after it has taken a meal or two. I know it's hard to wait but it's best for the snake. Young ball pythons get stressed out easily so they need time to adjust to their new environment.

Trust me, I know waiting isn't fun. I just got my first BP on the 21st of this month. Think of it this way: a few weeks isn't really a big deal since your snake will live 15-20 years. That's a lot of time for handling