Step by step how to learn: 1) practice in normal speed until you think you can do it really well 2) slowly work your way up the speeds, from normal to 1.25, making you can do each speed well 3) I think the real speed is 1.75 or 2.00. If you can’t do it that fast, don’t worry. It takes practice. Practice piano for 30 mins everyday. 4) When you think you can do it at a good speed, switch the volume off and try to play it without using the sound. Listen if you make mistakes, pause the video and practice them over and over again. 5) time to perform! I think this applies to every song you learn. If you’re reading sheet music, practice with a metronome instead. I really hope you found this useful. Tell me if they work in the reply section