@CurlyKristen - all common (and reasonable) questions! the $300 limit is the max dollar amount of gifts such as your wedding favors and OOT bags. note that's $300 per person - so you & your fiancé could take $600 total. add in a couple of friends who can take $300 each, and your total goes way up.
decor counts as personal property like your clothes and other belongings, unless you're planning to leave it behind. I would make sure you have your receipts with you for decor & gifts (separated), on the unlikely chance that Mexican custom's agents want to inspect your items further. It's rare, but it does happen. and no need to have it translated into Spanish. Most of those working in the airport speak English.
enjoy the holidays!
I am so sorry to keep asking so many questions but here's another one I have ordered the vases, candle holders, and a ton of other wedding supplies but now how do I get them to Mexico? I read somewhere that we can only take $300 worth of wedding supplies with us on the flight, is that true? And I also read that you have to have a note in spanish explaining that everything is for your wedding? Please advise.
Thanks! And Merry Christmas!