Trying to put myself in Moses's sandals for a moment here I am just caring for a flock, minding my own business when a bush out of no where catches fire and isn't being consumed. I think most would freak out a little. Not sure my first action would be lets go check out this flaming bush. Moses was apparently a very curious person. Perhaps maybe because it was God the bush seemed peaceful. Moses does fear when it starts talking and he knows it's God.
Verse 11 "But Moses said to God, 'Who am I that I should go to Pharaoh and bring the children of Israel out of Egypt?' 12 He said,'But I will be with you,..." It's not about you and your qualifications, it's all about who called you and who is with you!
God said His name was "I AM WHO I AM, the LORD (Yahweh in some translations) the God of your fathers, the God of Abraham, the God of Isaac, and the God of Jacob." The first part of that for me is like He is saying I Am the only God and am God of everything. Then He goes on to say He is the God of those known to have died on earth, yet He says "I am the God of ____" meaning while those persons may have died on earth they must be alive somewhere else.
God telling Moses to go tell the king of Egypt to let all the slaves go seems like a crazy request. But He wasn't having Moses go by himself and no I am not talking about the elders of Israel. The Pharaoh would have laughed at them. No God was going with them and showing just a small portion of His power. Cause again it's not about the person but who is with the person.
Finally not only was God freeing His people from slavery but He was going to give them the spoils of victory. Not by force even just by having the Hebrew women asking for stuff and the Egyptians would just be compelled to give it up. This shows it's not always about force.