Hands-down, the best advice I heard was actually on this forum - expect that things will go wrong. It may be something small, it may be something huge! But it’s very likely something is not going to go quite as planned. And that’s OK! Prepare to accept it and just roll with the punches on your wedding day. Sometimes brides become so hyper focused on planning every detail, that any deviation from it sends them spiraling and ruins (at least part of) their wedding day. Just remember, you will never get this day back again! So dont waste it being upset over flowers or a wardrobe malfunction. Laugh at the mishaps, and move on with your day 💕
Expecting things to go wrong is definitely great advice! There’s so much stress in wedding planning. Nothing goes perfectly, and as long as you’re married to the person you love at the end of it, you had a successful wedding! ❤️
My main piece of advice is communicate, communicate, communicate! Make sure your expectations are clear, whether it’s to your vendors, your bridesmaids, or your fiancé! And listen to their expectations and concerns in return!! Many times my fiancé and I have had to go “Okay, I don’t love X. Is that a key part of your image of the wedding, or can we figure out something else?”
I've been to many themed weddings that just didn't quite hit the mark. It takes a LOT of money to make a themed wedding all come together, from perfect venue, a photographer to fit the style you're going for, and decorations to make it all perfect (and side note, your friends and family may not be as enthusiastic to be making all your DIY decorations as you are). I recommend simply hosting a "wedding" themed wedding and sprinkling your theme in around that. A song for your first dance, color scheme, photo booth props, centerpieces, etc. can all be to suit your preferences without the whole event being a ________ party.
If you can swing it, I recommend buying and custom tailoring the groom's suit. We rented my husband's suit and it came in too baggy and the shop said they could only alter it so far - two days before the wedding, of course. My husband doesn't love how he looks in many of our pictures and wishes he had his own perfectly tailored suit like my perfectly tailored dress. And chances are, he'll get more use out of that suit than a bride will her dress anyway.
Lastly, invite the people you love. I invited some family members out of obligation and learned a few weeks later they were saying nasty things about me behind my back, like they always do. I've since cut them out of my life, but there they are in my wedding photos. I wish I would've saved some money and never bothered inviting people who don't like me to my wedding just because they're "family".