I lead ♥4, not T. Tough problem. Can't say for sure whether I'd play the 8 or the jack. Partner is marked with about 7-9 hcp, 2-3 trumps and 3-4 hearts. We beat this if we can get 3 heart and a minor suit trick or 2 heart and 2 minor suit tricks. If partner has lead from the T, we need him to have ♣A and ♦A or ♦K. If partner has lead from the K, we need him to have one minor suit A. I guess I'd play him for the latter, and insert the jack.