Great to hear from you - I'm also booked on this trip and very excited about it. It will be my second JY trip, having been on my first to Tunisia in April this year, which was just fabulous, so well organised. The itinery for Dubrovnik and Montenegro sounds amazing and I'm very much looking forward to visting these 2 countries, as they are new to me, although I have spent a year living in Bulgaria , which is similarly Balkan!
Look forward to meeting you on the trip, no doubt at Gatwick, and having a great holiday!