Measure the dimensions of your backyard and draw a plan to scale on graph paper, using one square to represent one square foot, or another suitable proportion. Draw utility boxes, meters, utility lines and poles, sheds, ponds and other permanent or desirable features on your plan. Contact your local utility services to find the position of underground lines or drains and draw them on your plan.
Observe the daylight patterns in your backyard and note how many hours of direct light each area receives in the course of a day. Assess the soil type, such as sand, clay or loam. Sand soil feels powdery between your fingers, clay forms hard or sticky lumps and loam soil is moist and crumbly. Select trees that suit the growing conditions, regional climate and the trees' intended functions.
Draw circles on your plan where your trees will grow, spaced according to their final dimensions. The diameter of each circle should represent the final width of the tree crown. Some overlap is desirable to give a natural effect or provide effective screening or shade.