The first step in any DIY screen installation project is accurate measurement. Measure the area where you plan to install the screen enclosure—whether it’s a patio, porch, or pool area. Ensure you take precise measurements for both the height and width of the enclosure. It's essential to double-check these measurements, as even a small error can result in the screen frame not fitting properly. Also, consider any obstructions like posts, rails, or existing structures that may affect the installation process.