Few first dates fail because of one dramatic moment. They fade because of small habits, and those are easy to fix.
Arriving unprepared
Pick the place, confirm the time, and arrive a little early. Reliability is attractive.
Checking your phone
Put it away. Leaving it face down on the table still tells her something else may matter more.
Talking only about yourself
Notice how much time you've spent talking. If you have gone on for several minutes, hand the conversation back with a question.
Trying too hard
Bragging, name-dropping, and rehearsed jokes all suggest you don't think you're enough as you are.
Being rude to staff
She will notice how you treat the server. Be polite and patient, always.
Drinking too much
One drink can relax you. Several will make you louder and less attentive, so stay sharp.
Pushing at the end
If the moment feels right, a kiss can be natural, but it should never be assumed. Read her response, and take any hesitation as a no.