Buying a grass mower or trimmer can be a daunting task. There are a few things you should consider before making your purchase. First, you should consider the size of the area you need to mow or trim. This will help you decide on the type and size of mower or trimmer that is best for your needs. Additionally, think about the terrain of your lawn and how often you plan to use the machine. Knowing this information will help you determine what features are most important for your needs, such as power source, cutting width, and maneuverability. Finally, compare prices between different models to find one that fits within your budget. With this knowledge in hand, you can make an informed decision when buying a grass mower or trimmer.