Hey Khara, this is just what we do in our house since we don't have a big "herp room"....oh I need to move LOL.
We put the new snakes either in our bedroom or in the back laundry room. The bedroom is for rescues or really stressed out snakes. We keep it very very quiet and low light and they stay in there for a long while, even more than a "normal" quarantine if they aren't eating well yet. The laundry room is currently housing Becky's BCI as he has had good vet checks and all that but still it's prudent to keep him apart from the balls at this time. It also gives him a bit more quiet than the livingroom would.
We feed, clean and handle the non-quarantined balls first, then wash, then repeat with the quarantined balls, then wash, then do Rauri the BCI last. The BCI exercises in our enclosed front porch, the non-quarantined balls exercise in the livingroom. Sounds like quite a process but it really isn't all that much work to try to ensure their health and it's just a good habit to wash after you handle even your single pet snake.
~~Jo~~