You need to be able to trust the people you are living with. If you think you wouldn’t be happy to go to sleep at night, or to leave your valuable things in the house with a prospective flatmate, the answer is simple—don’t move in.
Moving in Once you move into a household that has been established for some time, the biggest issue that you face will be how to fit in. The best way you can go about it is to be considerate of your other housemates. It is important to remember that everyone has their own way of doing things, as I’m sure you do, and there is nothing more irritating than a new person coming in and stuffing up the system.
Don’t interfere; just find out how the house works and try to quietly fit in. If you have never lived in shared accommodation before it is important to respect the personal space of the other people you are living with—just as you would at home. This means you don’t play loud music late at night, you don’t have to talk all the time, and you don’t barge in on other people while they are in the private space of their own bedroom.
Remember that all the little things count, and it is these things that will help you to be accepted and loved by the people that you live with. For example, writing down phone messages, cleaning up your mess in the kitchen, not having friends over who eat everyone else’s food, replacing the milk if you are the one to finish it, asking before you have a friend stay the night, and making sure you always lock the door behind you.