Worship and Warfare with music.
Everything that happened that was bad happened because you didn't pay attention to any of your course and they still let you go because you wanted to. Apply this to worship. If you don't know what you are doing, don't know music theory at all and you don't try to learn and be skilled with your instrument, that's what's going to happen. The enemy will over come you are you abilities cause in all reality, you don't have enough for leading people to worship or do it in a group. By yourself it's probably the same thing, but you are practicing. What can you do about it? Pray obviously and just keep pushing the enemy away. Take that situation with the battle and now you are trained. You payed attention to things and passed all the course with a really high score. What do you think would've happened? You probably had the brains to actually win and survive. It's not just the good things that happen during worship but the bad things and knowledge of your instrument and music will keep you much safe from the enemy. And you'll do better altogether too.