It's not an optimal way of doing it, but it can be done.

Seperate everything and move the cages as far from each other in the room as possible. Each cage and its contents should be cleaned on different days and each cleaning should have its own sponges, buckets, cleaners, etc. Ideally, feeding would occur on different days as well, but thats not always practical. If you must work with both animals on the same day, remember to work with your established animal first, then wash your hands and move on to the quarentined snake. Investing in some rubber/plastic gloves until the quarentine is over might also be helpful.

Like I said, it's not ideal, but it's better than nothing.

-adam