No matter what anyone says here, always listen to your SA first. Keep your expectations realistic, and make sure your SA knows what they are. Have funWhen I asked my new SA about what I need to do get one, she mentioned QB bags work on a waitlist system and once they are on my profile is just a matter of waiting till one arrives. She said in the meantime just to buy what I love and don't need to spend on high ticket items as H has varying price points across all categories. This seems to counteract what others have said that big ticket items are key to getting an offer.
ETA : a B30 should certainly be attainable at the boutique, but don’t forget to check authenticated reseller bags. Resale prices are softening.