Be Present
If you want to be good at something, you have to put forth the effort and be willing to make the necessary adjustments when things aren't up to par. The same efforts and plan of action should be devised when approaching marriage.
If a couple wants their marriage to work out and be successful, then both partners need to be present by making their relationship a priority. Be willing to spend time together, compromise so that each other's needs are appreciated and valued, and overall choose to be each other's unconditional reinforcement.