Your venue may come with a coordinator, but this person probably won't be able to provide all the services you'd like. A wedding planner will cover the rest of the details, so take the time to find someone who can meet all of your planning needs. Some wedding planners offer comprehensive wedding packages, while others oversee specific tasks. If you prefer, you can even choose a wedding planner to help out just during the week of the wedding. This way, you can enjoy the process of wedding preparations but leave last-minute tasks to someone else, which can alleviate a lot of stress.
For comprehensive planning packages, find out what services are included. Does the contract only cover the wedding, or will the planner help with preparations for the bridal shower, rehearsal dinner or honeymoon? Will he or she help you with creative aspects of the wedding (like developing a theme), or will the planner just handle vendors, setup and scheduling? Don't be shy about asking for services that may not be part of the normal wedding package, such as coordinating a catered lunch for the bridal room on your wedding day. Most planners are willing to do whatever it takes to make your event a success!