To believe in myself, for all the dreams I had for the company that I have achieved in someway there was always a certain 'I am not sure I/we could do that' some of these things I have not over come yet and it is only due to holding back and being in confident.

That and try to always listen to clients you achieve nothing through negativity and getting frustrated because they made a bad decision or won't listen achieves nothing think of something contrastive to solve it.