I hope you have booked by now. It is hard on your own the first time and I was a nervous wreck. I have since been on 18 different holidays, five with JU. So you are on your own for a few hours in the airport but I read my book and have a meal, and people do talk to you and its surprising how many people go on their own. Once you are in the coach at the other end everyone starts chatting you can relax.
I usually pair up with other travellers and dont think I would like to go with a friend as I like to do my own thing
or join the group. The only thing is when you get home you do miss all the cameraderie, but that prompts you to go again.