If you have the attitude that landscaping is the process of putting a tree in the ground green side up and all is well then your probably missing something.
To start, you should know what type of soil you'll be working in. The medium can range from heavy clay structrue to a very sandy structure. The structure of the soil may need amended. Amending the soil can be done by adding sand, peat, clay or simply by turning the soil over.
Besides soil structure the pH of the soil should be tested. If the pH is too high adding a bit of lime can reduce it. The pH of a soil effects the way plants grow because the uptake macro and micro nutrients that a plant needs is directly proportionate to the pH. For example, if the pH is too high a plant cannot retrieve the phosphorous that is right there in the ground.
When it comes down to putting the plant in the ground it is important to prepare the hole knowing that that spot will be this plants new home. The hole should be dug so that there is at least four to six inches of space between the soil that containes the root structure and the edge of the hole. The reason for all of the space is for bacfill. The soil that is put back into the hole to fill around the roots of the plant should be broken up and contain air pocket and good drainage. This does not mean that the soil should not be packed but just that the soil is not overly compacted.