Brenda Dykes says:
It it is hard to convince professional musicians of the difficulty in making a sound on the flute. It may take days, but that has no bearing on how good you will be in the end!
A mirror is your greatest friend at the start and remember to a) keep your teeth and gums firmly against the lip plate and b) BREATHE!
Here are a couple of pics that might bring a smile to your face! Captions please!