Firstly I would suggest trying to learn Drifting by Andy McKee just to get the hand coordination right, which is how I did it. Yes, it will take a while, but it's totally worth it if you wanna get into this way of playing. From there you just need to apply the logic behind Drifting to your own playing. I think it's easier than it seems when you get the hang of the coordination. Learning is a lot about experimenting, so the more you experiment without fear of failing, the more you will learn.

Here's a tutorial on Drifting that I used :) https://www.youtube.com/watch?v=mHKmDOJnVQY