Everyday we gain knowledge either by learning or by doing a mistake. No one is 100% perfect in what they do and hence never feel inferior when asked to lead a team. Management guys are good in running a team and the team which deals in a special department would be good in what they do.  It is how smart you are in learning fast and take over the position you are supposed to take care of which would need lot of homework. A discouraged person would never be able to lead a team as his inferiority complex would start overruling his ability to learn and at one point the team below him would sense it and which would ruin the whole team.