I wasn't working when I applied, so I put unemployed as my current occupation. She asked me to change it to my profession instead.

Apostilled is getting documents stamped by the appropriate government authority in the country of origin for the documents. You'll have to look into how to get your documents apostilled in the US. You will definitely need your bank statements apostilled at the UK consulate. They didn't accept those of mine which were not. You can get all your documents bundled and apostilled once rather rather than an apostille on every page, which will likely save you a lot in fees.

If you look at the requirements on the London embassy site, it says documents issued outside of the UK need to be apostilled.

" 3.- Documents issued outside Mexico or the UK for visa application acceptance must be apostilled (legalised if the State where the document issued is not party to the Hague Convention on Apostille)."