There Is No Checklist

There are a ton of articles out there about what to splurge on for your wedding. People spend quite a bit of their time writing about what they think is important and then telling you that you need it for your wedding day to be a success. These articles are not important, so don't listen.
There is not a single special checklist that makes all weddings great. Yes, you need to prioritize and made sure the majority of your money goes to the things that mean the most to you, but not everyone has the same idea of what is important. You do not need this, that, and a bouquet of roses to be a bride.
Just do what feels right. You don't need an expensive outfit to look beautiful. You're getting married! You're going to be so happy and glowing that you would be gorgeous in a burlap sack. Just find the perfect outfit for you whether it is a white dress, a black dress, a suit, or what have you and roll with it. Your wedding day is about you and your spouse to be, and if you feel your best in Chucks then kick off those heels that society threw on your feet and put on your favorite sneakers.
A wedding should be a cross between the best party you will ever throw and a show and tell of your love. Play your favorite songs, be at a meaningful place, eat the best food you can think of, and do what you love. You don't have to have a "ceremony, formal dinner, then dance" wedding. Maybe you really like tacos and chess, but can't dance to save your life. Then I recommend you set up a taco bar and a board game corner, which would be a lot better than awkwardly avoiding dancing throughout your entire wedding reception.
I don't know about you, but I try not to carry around a big bundle of regrets. I also try to do things my own way. Sometimes, things turn out a little kooky, but they always scream, "This is mine!" As an alternative bride, you probably want your wedding to be filled with your lovely personality. The best way to not regret choices you made at or for your wedding are to make all your choices for you and spouse to be. No matter how hard it may be, do not make them for your family, your friends, or that obnoxious lady at the dress shop who kept bringing you white dresses after you let it slip that you were looking for wedding attire when you specifically asked for green gowns.
Your wedding is probably the only day where you can publicly declare you love that loudly without garnering stares from passerby. Make it count and make it as unique as your personality because if you do your wedding that way, you can do no wrong.