Let me start by saying that I am a wedding planner …
For my last wedding I arrived at 11:00am and didn’t leave until 1:00am and I was on my feet almost the whole time. This was with a wedding where there was a vendor providing every service.
Here is an idea of what is typically involved/offer by a wedding coordinator.
The week of call all the vendors and coordinator deliveries and arrival times. Create a day-of schedule for the bride.
Rehearsal – handle and arrange rehearsal and all particapants.
Day of: pick up rental items, handle all calls/questions from vendors, run errands for bride and family, do any decorating or DIY items, place items needed during ceremony, supervise other vendors to assure accuracy, handle any and all emergencies as they arise.
During the reception collect bridal couple and family for each event (cake cutting, garter, etc). Give each vendor a 5 minute heads up so that they are ready to play music, announce, photo, video, etc. Repeat 5 – 7 times. Answer questions from vendors and guests.
Clean up and remove all personal items after ceremony and reception.
All that being said – a good friend could handle this for you. Just make sure they are organized and can take control when needed. A really small wedding (under 40) you may decide you don’t need one. However, if your ceremony is complicated, lots of participants, etc you may want to think about one. Same thing for the reception, for every event you will need someone to make sure that all participants and vendors are present. I hope this gives you some things to think about. Feel free to ask questions.