its also a good idea to get a lil diary or jotter and keep it as a record book for your snake, jot down feeding detaile, how many/what type/when/sucessful/refused/date etc and note down the date of each shed. this helps me know when my guys have shed last and can help predict when they will shed next after a lil while. like i know my BP Selma will shed roughly once every 2 months as he aint a baby no more but still isnt fully grown. i gathered this info from my record as he had shed 3 times in my care and each one was after 2 months +/-, knowing that i was able to predict his latest shed.

that and records are also useful if you change anything, if your bp stops eating or if you need to tell a vet what/when he last ate/shed.
in the event that you have to sell a snake a record also shows that it is a good feeder, how old it is and how often it sheds. so unless you have like 50 snakes a record is an easy ten minute job that takes no time at all to keep and can be quite valuable.