In marriage there is a lot of responsibility. Partners expect a lot out of each other whether it's being financially stable, providing material support, being emotionally available, present for raising children, being loving enough, good at X, Y, and Z things. All while juggling the myriad of responsibilities demanded from life.
Marriage probably doesn't always fit neatly and orderly into the box of life, but if it does then great.
We occasionally mess up and become inadequate to do what we should at all times. So I would say, be prepared to have a lot of grace, forgiveness, and patience to be "made for marriage." Because over a timeline of a lifelong pact with someone else these sorts of challenges I mentioned could possibly show up. Just something to think about.
I appreciate the way you worded this to leave room for things running perfectly smooth. It’s one of my pet peeves when people define the way things are (in their opinion), based in their experience or misfortune. I don’t say this in a haughty way, but sometimes people say “marriage is hard work” when what they really mean to say is that the person they are with is difficult.
I have my personal convictions about the way life should be, and praise God, I can have that life by His providence and goodness. It is miraculous, no doubt but that is what happens when you trust in God.