The marriage institution is a school of its own, one has a lot to learn before entering. And when you finally decide to enter, you have to study your potential partner so you don't miss any red flags.

For me I think the best is walking by God's counsel. The same way you can ask God for a thing and he gives it to you. Sometimes people say you have to find the wife yourself, as said by Proverbs, but remember Abraham's servant found a wife for his master's son, Isaac, but he asked God for signs along the way and those signs guided him.

Doing anything for the wrong reasons would almost always have terrible consequences. This include marriage as well. So one has been to extra careful. There are people that met their untimely demise because of marrying the wrong person.