I felt the same as you when I first tried to do the train chug…I felt like I was standing at the bottom of Everest looking up like….I’m suppose to climb that?!?!!
And you may already be doing this but I just started doing the train chug really slow on a metronome and each day when I tried it again I found I could do it a little faster. There is that point where it’s starts to sound so good and I’m thinking 🤔 is that really me? That was an awesome feeling! It definitely took time though. Hope this helps and good luck