Making your plan
Now take a piece of graph paper and draw a plan of your room to help you work out the best places to put your lights. It's better if it's to scale but it doesn't have to be.
Mark immoveable fixtures, such as fireplaces, alcoves, doors and windows
Next, mark with arrows which way people are likely to be facing - towards the television, for example, at a desk for working or towards the window if they like reading in a particular chair.
Mark the existing sockets. In many houses there aren't enough, which can result in dangerously overloaded plugs
To determine your circuits, mark where the light switches should be. Work logically round the entry and exit points in your home - it's frustrating when you have to feel around in the dark for a switch that is either on the wrong side of the door or non-existent.
Mark out where you'll place large pieces of furniture, such as sofas and beds.
Think about practicalities such as how you're going to change the bulb. What if you live in a room with extra-high ceilings or in a loft-style apartment and the spotlights are 20ft high in the air?