These people did not prepare only when they were assigned the tasks. Preparation with God, yes. But I'm not talking about seeking the Lord but having the relevant skills, the character, the maturity, the faith level, the knowledge of God & His word.. required for the tasks. These people had what it takes to do the job. Do you have what it takes for your moment in history?
These great men and great women of God were preparing all their lives for their one moment in history. They have been disciplining their flesh, studying God's word, strengthening their strengths & weakening their weaknesses. so that when God calls, they're ready. Whatever it may be.
David fought bears and lions, then he was asked to fight Goliath.Esther, had a year of disciplined beauty treatment, and she was selected Queen whom saved the Jews.Saul was fervor in His persecution of Christians, he later planted the more churches than all the disciples did together.
God doesn't play punk with Himself. He does not get us to do things that we are unable to do. Which means, if you do not have the ability to do big things, you will do smaller things. Of course, serving God is not about doing glorious big things, but if God has given you the ability to do greater things, why settle for just great things. That is not being faithful.
Don't know how much you can handle? Let God decide for you, you just give your best everytime.