I agree with a wrap
If you're worried about the tonne of material and how to tie it (although you'll get the hang of it in no-time!), then I'd say a Mei Tai for sure. They are fabulous!! Both are super for distributing weight so your shoulders don't get sore.
I don't have a pouch, but have used a ring sling quite a bit and find that whether it gets sore or not depends on where the shoulder is positioned. When it is out on the corner of the shoulder rather than closer to the neck I can carry my heavy little one (22 1/2 lbs!) for quite awhile without problems. Perhaps bring your pouch to the babywearing thing too in case someone can help you adjust it to be more comfortable?
Good luck!