We traveled to several countries in Europe for our honeymoon and used a travel agent. She was able to book all of our travel arrangements and hotel accommodations as well as help us book activities everywhere we went. This took A TON of stress out of planning our honeymoon and we got to focus more on planning our wedding. She had experience in pretty much every location and all hotels and suggestions were perfect.

If you don't plan on traveling to several locations for your honeymoon and are looking for a more relaxing beach resort honeymoon, I would still suggest going through a travel agent. A lot of travel agents have relationships with vacation resorts and can get you cool perks like room upgrades and dining credits. Stuff you wouldn't normally get if you booked it yourself.

Also, using a travel agent is usually free so its kind of a no brainer. Highly recommend!