Before making any move, make sure your hair are washed and well combed. This will give you a better idea of the current length of your hair. Applying conditioner is not required, but you must keep them wet one way or another.
The second step is to decide what length you want to have. It is very important to note the length you want to take off. For instance, one may wish to tie this to a physical landmark, such as the collarbone or chin.
After considering the length, stand right in front of the mirror. The best possible situation is to arrange a couple of mirrors, as it will help you see both front and back of your head.
For whole head method, gather your hair to the top of your head, making a ponytail. Make sure the pony is right in the middle of your head, holding all the hair. Otherwise, you may find the uneven layers.
Before using the scissor, twist the gathered hair as tightly as possible into one particular direction. It is imperative that you note the direction you have twisted them into.
Now, it is the time to cut off the length that you noted earlier. Make sure the cut is very straight. You will notice that the twisted hair have a similar length, but once you let it down, many different lengths will appear.
Comb the hair, making them very straight. Gather the hair again, and twist them in the opposite direction. Repeating the same step, make a straight cut. Another important thing is to snip off any stranglers.
The final step is to wash your hair. You will be glad to see the different layers of your hair.