Please remember you are NOT trying to contact anyone, that is mediumship.
Practice can be a dreaded word that brings back thoughts of piano lessons and times tables, but it is just as important in the world of the psychic. It's all about getting used to information coming to you from a different source. The more you practice, the easier it becomes. So what can you do? Try pausing before you do something. For example, when the phone rings, pause a few seconds before answering. Can you tell who it is? Try it when someone knocks at your front door. Try it at work. Can you tell when someone is happy, sad or preoccupied?
Your mind will have become used to receiving information with your usual senses, and it will take time for it to accept this transition. You may be attracted to Tarot cards, and these will help develop your psychic awareness. Also consider psychometry, for it will give you something physical to concentrate on.
You could ask close friends or relatives to let you hold an object belonging to them, such as a lighter, ring or keys. Calm your mind and while exploring the object with your hands, try to let a picture come into your mind. It may be very brief at first, but mention it to the object's owner anyway to see if he or she can relate to it. When you do this as a beginner, the pictures you see are often very trivial. For example, it could be something they were going to buy, a favorite color or that they missed a bus and were annoyed about it. Try to find someone who can be patient and understanding, and take your time. It's no use trying to force the information to come through. Above all, accept the fact that you are going to be wrong from time to time. The human mind has a habit of filling in the blanks when psychic intuition is not forthcoming. Also, perhaps a little confusingly, some of the information that may come through can have no bearing at the time, but come to light a few days later.
One important thing: if you do see a picture or get a feeling about something, pursue it. It's amazing how many people become satisfied with just a little bit of information when there is usually more to be had. It's great when you get it right, but more difficult is working out why you got it right. Try to remember what it felt like as the vision came into your mind so you can recapture the feeling next time.