"Surrender yourself to the Lord." Psalm 37:7 GWT
Surrendering to God isn't passive resignation, fatalism or an excuse for laziness. And it's not accepting the status quo. Actually, it may mean the opposite: sacrificing yourself, in order to change what needs to be changed. God only calls surrendered people to do battle on His behalf. So surrendering is not for cowards or doormats.
Surrendering is best demonstrated by obedience. It's saying, "Yes Lord" to whatever He asks of you. To say, "No, Lord" is a contradiction. How can you call Jesus "Lord," then refuse to obey Him?
After a night of failed fishing, Peter demonstrated real surrender when Jesus told him to try again. "Master, we've worked hard all night and haven't caught anything. But because you say so, I will let down the nets" (Luke 5:5 NIV). Surrendered people obey God even when it doesn't make sense - and the rewards are awesome!
Abraham followed God without knowing where it would take him. Hannah waited on God's timing without knowing when. Mary expected a miracle without knowing how. Joseph trusted God's purpose without knowing why circumstances happened the way they did. Each of these people were fully surrendered to God. "When will I know I'm fully surrendered?" you ask. When you can rely on Him to work things out instead of trying to manipulate others, force your own agenda or control the situation. You simply let go and let God. You don't have to be in charge.