It's a big step and one that is fraught with tests of your relationship.  Habits that may be endearing in small does can become irritating when they occur all the time--differences in needs and desires--ranging from simple things like personal habits, the need for entertainment or solitude, even what you want to eat or when to go to sleep can become points of contention.  Alvean and Doug talk about the considerations one should have in making the move to love and live together.  For more about this and a full transcript, click here:63-Moving In Together