If you want to switch, just offer the P/K rat to your snake on feeding day. Some snakes won't have any problem switching over and others need a little work. Just grasp the rat behind its neck and dangle it a few inches in front of your snake. It might help if you pre-scent the room about 15 minutes before feeding and you can also try warming the head of the rat under a lamp before introducing it to your snake.

There are pros and cons to every feeding method whether it's live, F/T or P/K. The most obvious reason why live is considered safer is because the rat can't harm your snake, although if done responsibly that isn't a very big risk. "Feeding live prey responsibly" simply means feeding an appropriately sized rat and monitoring the feeding. If your snake doesn't show interest after 10 minutes, remove the prey and try again in a week. Most of the horror stories you read about regarding live prey harming the snake are because people will leave the rat or mouse in the snakes cage overnight or even over several days.

Occasionally a rat or mouse will bite the snake while its being constricted. If that happens, make sure you clean the wound and apply an antibiotic ointment or seek vet care if it looks severe.