I had a little bit of difficulty at first, and I was punished badly for it. End up hopping and not firing any arrows.
I eventually overcame that hurdle though, by watching this video (
http://www.youtube.com/watch?v=XcODP-_bhrI) over and over again until the timing was ingrained into my head. Went into the practice room, spent about half an hour, and eventually I managed to string three SHDAs in a row. Then I went into fits of joy, but that isn't necessary if you don't want to.
After that, the timing for all TL's quickdraw techniques are near enough the same. With bomb pull -> QD you need to be a bit quicker. Sometimes you can be too quick, and you'll press B during TL's jump lag. If you think that's happening, try hitting B a bit later, and B again just as TL lands.
It'll come with practice. Also, I use the L trigger for jumping. It's a bit awkward with Y / X.