Incubation temps of 89-91 make 52 days enough time for the snake to develop and cutting can be performed safely at this time.
As for your question about setting up, when the snake emerges and leaves the shell on it's own it can be safely cleaned up, popped to determine sex and set up in it's own enclosure. Keep in mind (since you did not mention it) that you will want to make sure you use paper towel as a substrate and keep it damp until the snake sheds.
After that it becomes like any other snake in your collection, good luck with the first few feedings.
I cut because I am impatient and to suit my schedule to ensure I am available to take care of the hatchlings.
-Steven