these tips work well for both hs and ts 3s.
wait until you're at the peak of your jump before you pull on the handle to initiate your spin. concentrate on the handle pull and the handle pass. the rotation will happen, don't worry about that.
an easier tip for ts3 is at the peak of your jump, do a ts180. do that a couple times. then, do the same thing, but before you land, pull on the handle a bit more for the remaining 180, and voila - ts3!
either way, keep the handle close to you...it's much harder to pull and pass if your arms are out.