God only wants our availability not our ability to work with. When we make ourselves available, then He works in us to be capable for God and His work. He told the three fishermen to come and He would make them to become fishers of men.
“Yes, it is God who is working in you. He helps you want to do what pleases him, and he gives you the power to do it.” Phil. 2:13 (ERV) 
School of Tyrannus 