Shrub Pruning Basics
Step 1: Lay out a tarp or something to catch the debris to make the cleanup easier.
Step 2: Remove any unwanted growth such as branches that have grown out further than the others. Try to trim it down to a symmetrical and uniform shape that is not wide at the top, so sunlight can hit the lower parts of the plant.
Step 3: Some branches will have grown thicker at the outer surface of the shrub, making it look uneven. You want to cut these branches further down into the shrub to thin the outer foliage and let sunlight penetrate to the lower levels of the plant. This will also promote new growth, so don't be worried if it looks like there is a hole in your shrub. It will fill in.
Step 4: Make sure you cut away any dead or diseased branches, as well as suckers, which are small branches that sprout at the base of the trunk. These siphon nutrients from the plant into less desired places.