Luckily for me, Eddie has quite smooth, slow canter, so it only took me about 12 lessons to feel comfortable. However, I mainly hack out at my barn, because we have some amazing hacking routes which I love, so I always feel a bit unbalanced when we’re cantering indoors, because he’s more speedy indoors, and I’m not used to corners (no outdoor unfortunately). Usually in the winter months, I start out doing stirrupless work and building it up until I feel balanced, and then trying a canter (with stirrups or without), but immediately slowing down if I don’t feel comfortable. Usually it takes a few lessons before I add in a canter, though. Hope this helps!