Getting married is one of the biggest events you'll experience in your life. It's not just a big lavish and expensive party celebrating you. It's two people who love each other above all others, and join their lives committing to love each other for ever. It's romantic and beautiful and amazing. After all, your relationship is perfect and that's why you're getting married.
Pump the breaks for a sec, k? That's not reality. Reality is that we are all imperfect, set in our ways, stubborn at some level, think we know best, and are human. Regular old humans. Don't worry, I'm going to tell you how you can handle some (not all) of these issues.
Getting married is a huge responsibility. You already know your partner's behaviors and habits and if you say you don't/didn't know, you're just deflecting your own responsibility. Don't DO that! You are responsible for your own well-being and happiness.