Remember, before you teach, to give the pianist the songs ahead of time. Also, pray for the spirit to be with you!
Tips on how to teach a song:
1. BE CONFIDENT. So you're not the best singer. So what? Practice. Ask for help. Or maybe you're a great singer but being in front of a bunch of children who are adorably cute makes you nervous. You are amazing. You are awesome!! You can do this!!!
2. KNOW THE SONG. Know the melody, know ALL the words. How can you expect to teach a song that you haven't practiced or do not know? It doesn't have to be perfect and you'll probably make mistakes. But it is better to have a song semi-memorized than holding a big bulky book and looking confused.