Well you have plenty of time to plan and save.
One thing I think of too, are the right suitcases to have your things in. After traveling a lot myself, I've honed down to some pretty good ways of organizing my things.
They have travel zip up small bags that fold in half, with a small coat hanger hook at the top, that hold all my things for easy bathroom use. They are wonderful for not taking up any space in a bathroom. Or a need for a shelf or medicine cabinet. Just hang the hook on top of anything, a door, or a towel hook, and I have my makeup, brushes, creams, shampoo and conditioner, toothbrush , everything, right there organized and tucked neatly in my small bag. That, in turn, Packs neatly in my suitcase. You never need to worry about taking up space again. On a trip such as yours, in a small group setting of travelers, these things are invaluable. Or even traveling alone, for me, this is a perfect setup.
A good safe suitcase would be in order too. Ive never owned a hard case, but got one finally. It is perfect to hold everything I want with nice storage room . It would be a checked bag , the size I have, but so worth it . A hard case also allows you to lock it with TSA combo locks if you want. I roll up my clothes , which makes no wrinkles and compacts better in the compartments.
Finally, I really like the hands-free backpacks. Got one of those with all kinds of pockets for laptop, etc., and special pockets that are on the back, up against you , that are inaccessible from the outside , when you have to have your wallet, money, keys, etc, off your person for the TSA checks.
You probably know a lot of these things , so apologies for the reminders. I just wished someone would have shared with me long ago so I wouldn't have gone so long in learning. It's just when your traveling methods are very compact and organized, you feel so good at living out of them along the way.