Update a new wordpress theme and install some functionaliy

Hi All, I'm talking about 1 particular site: I would like to update it to a new template, but keep a similar / header / homepage design. Functionality that must be confirmed working: 1) Vehicle refine tool so customers can select their vehicle - which uses advanced custom fields. 2) Currency switching based on customer IP. And widget to change currency if needed in the header. I need this updated ASAP. As in the next few hours. Please bid FinishedInHours to confirm your understanding