[Anzu]

For first-timer you should use a bit of vaseline (lube or moist conditioner also works) to apply around the base of your dick everytime you wear on, it will help your dick to get more comfy with the cage. If you are horny, try to only play with your nipples, it will help you build a sensitive wire of your nips and dick.

For the first week, try to wear for 6 hours a day
Increase the ammount of time wearing chastity to suit with your desire.
After that, try to practice wearing it for 2 days then take off to clean your dick and wear back, repeating in 4 weeks and the result might surprise you! Have fun!