Your age has nothing to do with your stress level....but yes in my opinion you should.
They take care of everything from making sure the vendors are on time, making sure your ceremony runs on time, and making sure little things are done like candles are lit and centerpieces are perfect. They are worth every penny.
The good thing is, you have plenty of time! A 2+ year engagement is awesome for planning. So don't stress! I do agree, some younger brides seem to have a harder time planning if they've been to less weddings or aren't as experienced with weddings. I hired a month of coordinator. So we do all the planning prior, and the final month she does all the confirmations & day of scheduling & works the day of the wedding to make sure everything goes smoothly. When we get married, our engagement will be 19 months long so I felt it was more than enough time to plan so I didn't need a planner. But if it's in your budget (the quotes I got were between $1,000-$5,000 for full wedding planning) and you'd rather not deal with all the little details, I'd say get one for sure!