Wedding Planners

Ba
What do you ladies think of wedding planners? Are they worth the cost? My so and I are planning a long engagement (a little over 3 years) and  just doing the research on prices, themes, etc. is already stressing me out. The spring we get married is also going to be the same spring I graduate from my masters program so I'm not sure if it's worth stressing over. Any help or tips is appreciated!