To install plastic anchors, follow these steps:

1. **Select the Right Size**: Plastic anchors come in various sizes to accommodate different screw diameters. Choose an anchor size that matches the diameter of the screw you intend to use.

2. **Drill the Hole**: Use an electric drill and a drill bit that matches the size of the anchor. The size of the drill bit should be slightly smaller than the diameter of the anchor. If the anchor is 1/4 inch, for example, use a 3/16 inch drill bit. Drill a hole in the wall or surface where you want to insert the anchor.

3. **Insert the Anchor**: After drilling the hole, gently tap the plastic anchor into the hole using a hammer. Make sure the anchor is flush with the surface of the wall or slightly below.

4. **Insert the Screw**: Once the anchor is in place, insert the screw into the center of the anchor. Use a screwdriver or a power drill to tighten the screw. As you tighten the screw, the anchor will expand, securing itself firmly into the wall.

5. **Check the Stability**: After the screw is fully tightened, check to ensure that the anchor is secure and the screw is holding firmly in place. You can give it a gentle tug to test its stability.

6. **Repeat if Necessary**: If you need to install multiple anchors, repeat the process for each anchor, ensuring proper spacing and alignment.

7. **Finish**: Once all anchors are installed and screws are tightened, you can hang your object or fixture securely onto the wall.

It's important to note that while plastic anchors are suitable for lightweight applications, such as hanging pictures or small shelves, they may not provide sufficient support for heavier items. In such cases, consider using metal anchors or alternative mounting methods. Additionally, always follow the manufacturer's instructions for the specific type of plastic anchor you are using.