Don't worry too much about preparing for the shed. If your husbandry is correct, leaving him alone and bumping the humidity once the eyes cloud up is good enough. Shed cycle is going to vary based on growth, changes in temps, whether there are any minor injuries that need help healing, etc. It's pretty frequent in very young snakes, and over time it slows down to 2-4 times a year. I would imagine if he is eating well he is probably pretty close to shedding if he hasn't since he has been with you unless he hatched last year or before.