My fiancee has secured a working visa in USA. We are both Australian citizens and I am planning on joining him. We are leaving Mid-October, and I will only be on an ESTA VWP 90 day visa, as I will be applying for a E3-D once we're married. We are planning on getting married in December in USA.
Question: Am I able to change from an ESTA to a E3-D if I go to a US Embassy in Canada or even London, or do I have to come back to Australia to do so?
If I do have to come back to Australia, does anyone know how long this will take to get if I book in my appointment prior to flying back.