The night before you clone pH some water to 5.5 Then dunk the cubes and let them soak for like 5-6 seconds. Put them in their tray with the dome on under the light so they are nice and warm and ready for you the next day. Then I use nail clippers to clip the branch from the plant to help crush the wound shut causing less stress. The I use a razor and cut diagonally, Dip in rooting gel,in the cube then back under the light. Keep the light cycle the same for your clones as you had for the original plant(Optimal for vegging and cloning is 16/8 according to a book I got, but don't switch the light cyclesit will stress the clones. Anyways Your cubes shoud be good for about a week under the dome, Then water with pH'd water again. Keep the humidity high and the clones misted with plain water.