I think what you are doing is awesome..I LOVE to here rescue stories!! They are the best and it sounds like you are really preparing.
Not handling him for a week will not make him more aggresive at all. Balls by nature are one of the more passive snakes and will typically (especially as babies) ball up. Hence the name. They are very head shy as this is their most vunerable area. The no handling for a week is to just give him time to become acustom to his new environment and settle down and they are prone to become stressed. With added stress it could lower their immune system. That is all.
It sounds to me like you are on a great track and I am so glad that other poster listed questions for you to ask.