Your vendors are booked and you're all set for the big day... except for one thing: The schedule. How on Earth are you supposed to know who needs to be where, and when?
Between hair, makeup, and photos, it's important that things run as smoothly as possible before your ceremony (I mean, duh).
First, speak with your photographer. Will he or she be on hand to capture your party getting glammed up? What about First Looks before the ceremony begins? Family pics? Wedding party photos? How much time does your photographer need if you are taking photos before the ceremony? The photographer should give you times of when (s)he is going to arrive, start taking the photos, and what the photography schedule will look like. Now, you can start planning around everyone else.
The next step is to ask your makeup artist and hair stylist how much time they allot per service. For example, for makeup applications, I save 45 minutes for each bridesmaid and one hour per bride. Hair styling times can vary depending on length of hair and type of style, so be sure to communicate with your stylist about your ideal looks for both you and your party.
As far as which comes first - hair or makeup - typically we know how to work around each other. If a bridesmaid's hair is already done when she sits in my makeup chair, I have no issue carefully working around a beautiful hair style without messing anything up. It can actually help having the hair already done so that the client can get the whole look all at once. Have you ever done your makeup but left your hair messy or flat? Yeah, somehow the makeup can sometimes look a bit... "too much."
If the photographer is going to capture photos of the party getting ready, you need to schedule yourself in either hair or makeup usually about 20 minutes after the photographer is set to arrive. They may want to walk around and get a feel for the lighting or get the detail shots (such as your shoes, dress buttons, bridal corsages, etc.) before coming and taking your getting ready photos. Of course, if you're already done with hair and makeup by the time the photographer comes around, the makeup artist can simply act like she's powdering you or applying lipstick. And also note that it's better to already have some makeup/hair done than have nothing done at all.
You're ready to make your schedule! Simply swap out the people who are getting beauty services - try not to have someone getting hair and makeup done at the same time. Granted, it can be done, but it's easier to do one at a time. Here is an example of how you can do the Wedding Day Timeline, with one hair stylist, one makeup artist, and 45 minutes per person (save for the bride - she gets an hour):
Okay, but what happens if hair or makeup goes over the allotted time? What if a bridesmaid can't be found when she's supposed to be getting her hair done? Try and combat these issues by emailing the timeline to each person receiving services and printing out a copy and placing it in the getting-ready suite for everyone to see. Don't forget to send it to your hair and makeup vendors, too! But things happen, and the schedule may get switched up. Of course party members can switch places on the schedule if need be, and as long as the artists know that the schedule is starting to get out of order, we can adjust our timing as best as possible in order to accommodate. Communication is key! Little anecdote: I once had a party member show up four hours late. She showed up 45 minutes before the first photos were supposed to begin. I knew it was crunch time, and I was able to finish her look in about 25 minutes. She then had to go into hair (and luckily she was already dressed for the wedding). But as I was packing up, she was still in hair... and pictures had started without her. I knew we were in crunch time mode but I'm not sure if the hairstylist knew. This is why it's so important to have constant communication about the schedule, and a timeline to guide you throughout the day. Even though the schedule got thrown a bit, we adjust and make the best out of it. She still got to be in some pictures and I hear the wedding turned out amazing.
I'm not saying this to stress you, I'm saying this to let you know that it's all going to be okay. Trust your vendors, trust your friends and family, and know that it's going to be okay even if there are small nuances.
There's a lot to think about for your big day, so I hope this helps and gives you some guidance for making your schedule. Congratulations!