SOPP376: I work at a church where organist is required to play and sing at the same time

This question was sent by Damian. And, he writes: You once asked me what is my biggest challenge in organ playing. I play in a church, and in Poland a church organist must play at the same time (hands and feet of course), sing and switch song lyrics that are displayed on the screen. This is the biggest challenge for me to do all these things at the same time, and to do all of them well. As for the technique itself, I'm not very advanced, but I happen to make mistakes in very easy fragments of songs that I know well, which I've always done correctly and I never know when I will stumble somewhere. Eliminating this is the biggest challenge for me right now. Thank you for all your work!