SOPP271: My dream is to become proficient at playing hymns on the organ, after years of not playing

This question was sent by Becca and Becca writes: My dream is to become a proficient at playing hymns on the organ, after years of not playing. Piano was my concentration of study. Besides serious practice, the following three things are holding me back: 1. Finding the best approach to reacquainting myself with playing the organ, in general. 2. Need to refresh the technique of playing the foot pedals. 3. A better understanding of the use of registration in hymn playing.