trick yourself into thinking if you don't get this girl then you don't really care. there's plenty of girls out there right? why is this one so special? i'm not saying treat girls like dirt, but it certainly helps yourself to go into a situation not thinking subconsciously that it's important you don't fuck up. what if you do fuck up? you'll be down on yourself for a while after that. that's why you must eliminate any doubt, even if you don't think it's there, look HARDER