If you are not familiar with traveling, a TA might be the better route for you.
You are not responsible for arranging all the travel for your guests, but the easier you can make it for them, the more likely they will be to come.
None of my guests have ever been to Hawaii before and because of that fact, I want them to be prepared for the costs associated before booking. Things like needing a rental car and average flight costs. Also the price of excursions. I didn't want them to get there and then to be surprised by how much things cost. Hawaii definately has the perception of being expensive, but through research I have made it really affordable. It really is only going to end up costing our guests $1000-$1500 pp for travel, hotel and car which isn't that bad.
I also really enjoy the researching process. My FI jokes that I am the planning Nazi, because I am so anal about it, but I like to have all the questions answered beforehand so that when it comes down to the actual vacation part, I can sit back and enjoy:) I always thought that I would make a good TA....
I am also really happy with the number of guests attending. I have a really small family and so does my FI! I really only wanted 15 people and my number has doubled, so I am hoping that I can still maintain the intimate feel that I wanted.
You should post pics of your dress! We would love to see:)