I have no problem with its pronunciation in British English, but in American English, yes. Do it have a sound like /əʊ/ as in 'go' or /ɒ/ as in 'got'? And I know that /ɔː/ and /əʊ/ aren't pronounced exactly like each other, and /ɔː/ and /ɒ/, but I can't write the sounds and my mean is their likeness.
I'm a bit puzzled about your question, did you try first google results?
This lesson on pronuncian.com display a scheme, explain how to place your tongue and examples to listen.
The entire tongue is pushed back and kept low during the pronunciation of the aw sound. [...]
I may not have answered you question, can you be more specific about why are not you able to pronounce it?