Is a wedding planner worth the extra cost?

My fiance and I both come from extensive immediate and extended families, we are both Aboriginal descent with my family spreading across the state of VIC and his family spreading across NT, NSW and VIC. As a result of this, we have a huge guest list (trust me, we have been brutal in trying to cut it down.) We are trying to find ways to cut costs where we can, but it is becoming time-consuming for me to research everything. I currently work full time in a job where I travel across the state regularly while studying full time and being a business owner. So my main question are they worth the extra cost?