The short answer is YES!
Not everyone can afford a really good one. So make a list of what you have the capacity to do yourself and what you need help with. Next, make some calls.
You should check the reputation of your planner. Read posts about them, check their Facebook and Pinterest pages. See what education they have or years in the biz. The Better Business Bureau can give you insight as well. Look at photos of actual weddings.
I attended a planning session with a bride and her family a while back, and overheard the bride say (as she walked away), "they just don't get it".
Can't say no? A strong planner will help you smooth ruffled feathers and step in to tactfully deny or accept "help". Unfortunately there was no planner and the wedding night ended with a lot of regret.
Today's planners offer a whole lot more than they used to. Chances are you can tailor a package to fit your needs.