One crucial thing is overcoming the disgust factor and learning to love the feeling.
So when you cum on your face in this first week, I want you to increase the time between doing it and wiping the cum off your face.
On day 1 you can wipe it off instantly...but let's say on day 2 you keep your cum on your face for 15 seconds...and increase it by 15 seconds every day.
On day 7, if you don't quit by then, you will cum on your face and savour it like that for 75 seconds.
This is just an example, you can do more if you want to. Minimum is 15 seconds difference.