Looking up tutorials on Youtube and practicing yourself is pretty much what you need to do... You basically crouch, hold back and then keep jumping each time you land on the ground... You need to get the timing right. The moment you're about the land on the ground, press jump, etc. Backwards bhop is the easiest. Once you've learned backwards bhop, then learn frontwards bhop while running, or put it into transition with your backwards bhop. It'll be easier to learn once you've learn the backwards bhop.