There is an old saying, “marry in haste, repent at leisure” .
Marriage is not generally though to be a vocation but it is and like other vocations should go through the same process. Each Catholic party need to discern and if the other partner is not a Catholic they will naturally think about the commitment they are heading towards; both lives will be changed forever.
Discernment is a term used in Christian tradition to describe the process of discerning God's will for one's life. In large part, it describes the interior search for an answer to the question of one's vocation, namely, determining whether or not God is calling one to the married life, single life, religious life; ordained ministry or priesthood or any other ministerial calling by virtue of Baptism.
So this means we all should seek to know what God wants of us not the other way round. “what do I need to do to make sure I am ready for marriage?” In other words, “am I responding adequately to God’s invitation through my baptism to love and serve Him through marriage?”