With only two snakes quarantine should be simple. In addition to dakski's spot on recommendations, I'd just suggest that you do the snake keeping for each snake on different days.
You shouldn't be handling everyday anyhow. So just alternate days. Handle and change water for the snakelet on (say) Monday. Tuesday do the same for the 2+ year old. Wednesday, the snakelet again, Thursday the 2+. Just keep changing it up like that for a few months.
That schedule is just for the purpose of an example. Many snakes get stressed at being handled even every other day. But you get what I mean.
The only issue is cleaning poop. If you need to clean poop, don't go near the other snake the same day you clean the one's mess. The worst nastiness is transmitted in feces.
It's nigh impossible to resist getting more snakes, but good hygiene and proper quarantine is essential. You really don't want to learn these things the hard way.