are these difficult to attain? I'm looking into the possibility of a permanent move to America (if it's within the realms of feasibility). Obviously I need to prove that I have employment waiting, but does this need to be a full time 'professional' job? Will I have to brush up on my knowledge of the amendments? How many months will it take to process? Is it worth making a trip to the U.S. embassy in London to ask these things? Please point out any glaring issues and stuff.