In life we are usually in a storm, coming out of a storm or heading into one. And often its not just one. To be strong in the midst of it all is an expression of faith. There is no moving forward without some strength and courage, but most of all, without faith.
Do you think God would leave Joshua high and dry? If God has called you, he is with you. Courage doesn't mean that we am not afraid. It means that we fear God more than we fear our situations. We trust in the divine resources of the Lord our God more than the resources of man.