Yup, I generally do my very best to be honest, declare etc, even when I bought back Parmesan from Europe I too had looked up the rules and printed them out - agent told me he'd never had someone know that rule before!

My biggest problem is gifts - some things I can guesstimate (like the jacket my mother got me) but other things, like a custom made silver bracelet (made as a one of a kind for me by a friend) how do you even start? I guessed at a number, but it could have been way way off. Another friend gave me a designer watch - I went with a price on eBay for that estimate.