It doesn't really matter how you get in front of it to jump for it as you will get the same animation regardless.
If you hit Y within a certain window you will trigger an agressive catch animation (i.e. the spinning jump catch). I'm not sure if holding or tapping Y has any difference as most of the time it is a snap decision and you either get the animation or hope one of the other regular catches works out.
I've gotten to the point I can do it pretty consistently if I am in front of the designated landing spot but the only advice I can give you when it comes to making a jumping animation is to practice till you find the timing.
You aren't trying to trigger the rocket catch animation (the strafe catch you see db's and lb's use) you hope to get the spectacular catch jump that way no one will say you are cheating. Check your spectacular catch rating so that you know which WR have the best shot at pulling off the animation.