I saw this job posted and thought about applying for it for about 3 seconds. Then decided I have no experience crossing the atlantic, in the winter, with no deicing capability, and in a 172 none the less. I remember the compensation being negotiable. I sure as hell hope you are getting a large chunk of change for doing this. I think it is a good idea that you are asking for help. And I wish you all the luck.
Make sure when you get back to let us know how it went.