I just got it done recently, so it is sort of fresh in my mind. I suggest you get the earliest appointment (8:30am). Sit on the chairs closest to the entrance (this does matter). At about 8:20am a lady with a clip board will approach the first person on the chair and ask for their name and appointment slip. She will start matching up appointments slips against her list. Once she checks you off, you wait on line to enter. The line up matters because if you want to get out of Dodge quickly be the first couple of people she checks in. At the embassy entrance you will go through a metal detector and they will take your cell phone away and lock it up and give you a receipt. You should have your paperwork filled out and documents ready. You go to a window, hand in the form, then go to the cashier right outside and make payment (I paid by credit card). They then give you an option to come back to pick up your passport (don't do this unless it is urgent) or by registered mail. If you registered choose mail, you go to the basement and there is a post office window on the left side of the room. You give them HKD$35 bucks or so, they give you a receipt and you get your passport in the mail in less than 7 days. I got mine in 3 days. Amazing service in HK. I was out of there before 9am. It was painless. Probably easier than getting a US money order and mailing it in. Good luck.