Are you being just the tiniest bit too harsh on someone right now? If you can be more flexible, they can be more flexible too: you just have to give them a chance to show you! You two can work well together, but first you have to trust each other! Let go and believe that this person will meet your expectations. It's true that you might have to give them a bit more time than you would like, but isn't it better to wait for what you want than to rush and not get what you need?