I'm very paranoid when bringing new animals into my collection as well. I do a strict 90 day quarantine in a completely seperate building from my shop for all new arrivals.

If you don't have the luxury of a seperate building or even seperate room, a good practice is to handle and care for quarantined animals on their own special day. Pick a day of the week where all you will do is handle the quarantined snake (cleaning, feeding, etc) and on that day, do not touch any of your other snakes or enclosures.

Also, if you're going to house a new snake in the same rack with an existing animal, pre-treating tubs with Provent a Mite is a pretty good idea.

Hope this helps.

-adam