Switching from live to frozen

[200xth]

but I hear it's pretty hard... Any advice??

Depends almost entirely on the snake.

Some will take to it extremely easily. Offer FT food, the snake takes it instantly, there is literally nothing you need to do.

Some will take to it slowly and require a bit of time and/or effort.

Some will refuse it entirely and accept only live.

The only way to find out is to offer and see what happens.

I will say that at 156g, if your snake does not switch easily after a couple of attempts, you may want to feed live for a while and wait until the snake has put on some weight to try switching again. I personally feel at that size it's more important the snake eats and gains weight than what it eats.