Personally I'd recommend that you posted, even if you do manage to get a solution which others later correct. Quite often on here I've seen someone post something and thought 'Yes, that's how I'd do it too', only to then see problems others have pointed out with the solution. It's always useful to learn from the side-discussions that spring up.

It would probably be a good idea to say you're not absolutely certain however, and preferably test your solution with a bit of test data if you can though.

Well done for the relaxed attitude about XP too!