AVA245: I have never played hymn melody in feet or in tenor range

This question was sent by William. And he writes: Do you have any advice for organists who have never played hymn melody in feet or in tenor range? I have been trying all week to do this on hymn amazing grace. I am having hard time. Is it a waste to learn this process? I am trying to begin to improvise and so much I read say to do this and then practice in different keys. It is really hard for me. Is this a God given talent or something that I can learn by practice? Someone told me today if cannot do it it is you can not learn. Another I read to transpose everything to C Major and then you can eventually play by ear instead of thinking about intervals. Do you have as part of your course a step by set way to learn to improvise? I just want so bad to learn improvisation. Is ear training the basic problem? Thanks. William