Leviticus chapter 9. 

God used Moses over a period of time to instruct Aaron and his sons on how to do all the offerings which included preparations and the actual offering. When the time came when they actually did it I'm sure they were:

1. Nervous. Am I doing it right? Am I going to mess up? Will God be pleased? Am I really the right person for this job or ministry?

2. Humbled. God has called ME to do this!!! HE COULD HAVE CALLED ANYBODY BUT HE CALLED ME!!!

Perhaps we have felt such feelings. Let us not forget God loves us and has a call and purpose for each of us. Yes, take it serious! Train hard! Study hard! Be the best student while being trained by God, but you will feel nervous and scared or overwhelmed. But trust God! He will show grace and mercy when we mess up. We learn from mistakes and move on. Don't let Satan tear you down. Remember God doesn't call the qualified but qualifies the called.

And yes, be humbled. Stay humble. Humility keeps things in the proper perspective. It's not me who's doing great things but God working through me to do great things for himself! He wants to bring glory to his name and not glory for me. Once you remove humility you bring on pride or arrogance and once pride comes in, God gets pushed out. And it's all about “Look what I've done,” versus “Look what God is doing!”

When the glory of God appeared, the people rejoiced and we're humbled before the Lord. When God does great things, don't let it go by unappreciatively. REJOICE when you see God working. And stay humble! Always give glory and thanks to God!