It's not difficult really, I send stuff in every now and then. Just a form to be filled in and then sent with the coin to the appropriate place. You need to be a paying member to submit on your own, or do it via a third party. Once you've done, it'll be easy. I'm lucky in that I call into the London office and leave everything there. Turnaround is always in working day, so 2 to 3 months in general.