I just recently learned to bend and I figured since it is such a hard concept to convey i would throw out my two cents on it out here before i forgot. You may or may not get anything from this, but this is just what helped me. When i first started trying to bend i was really trying to warp my embouchure and i kept getting multiple notes. After looking online i stumbled across something that suggested when you first start to tape up all the holes but the one you are working on to get a feel for i bend. I dont remember where i got that, for all i know it may have been here. Anyway that helped alot and as i progressed i would uncover hole and try again. I couldn't get past bending with three holes open. I kept trying but just couldnt get it. I was looking at bending online and figured id try a blow bend, what most sites suggest as either impossible or much more difficult. The very first try i successfully bent the 8 blow hole. 2nd try i bent 9 blow. a couple tries for 10. I was surprised, but not yet satisfied. I think part of the reason i was able to hit this on the first shot is that i am a primarily a saxophone player and can reach an altissimo A which requires quite an embouchure. I picked up a harmonica because i couldnt resist the thought of never being without music. After i got the feel for blow bending i went back down to the draw bends and immediately i could draw bend. I think i got the feel of the bends down on the higher register and then moving to the "easier" draw bends wasn't a problem. Anyway, thats my story for what its worth. I found hearing a lot of other peoples progression to kind of help me to learn to bend so i figured id throw this out there. Some other stuff worth noting is all this happened within a day, I got my first harmonica (marineband key of c) on saturday, and i just got solid single notes on sunday. I would have put this in the beginner section saying i am a total beginner, but hey, this is supposed to be an advanced topic so here it is and hope it helps.