Here are the general steps to use a line household hair clipper:

1. Prepare the hair: Before you start cutting, make sure the hair is clean and dry. Comb or brush the hair to remove tangles and knots.

2. Choose the right guard: Line household hair clippers typically come with different guard sizes that determine the length of the cut. Choose the appropriate guard for the desired hair length.

3. Attach the guard: Attach the selected guard to the clipper according to the manufacturer's instructions. Make sure it is securely in place.

4. Turn on the clipper: Turn on the clipper and let it run for a few seconds to ensure it is working properly.

5. Start cutting: Hold the clipper with the blade facing downwards and move it against the direction of hair growth. Use long, smooth strokes and avoid going over the same area multiple times.

6. Adjust the guard: If you need to cut shorter or longer hair, you can switch to a different guard size or adjust the length of the guard.

7. Trim around the edges: Use scissors or a trimmer to clean up the edges around the hairline, ears, and neck.

8. Clean the clipper: After use, turn off the clipper and remove the guard. Use a brush or a cleaning tool to remove any hair or debris from the blades.

Line household hair clippers are designed for easy use at home, and following these steps can help you achieve a clean and even haircut. Always follow the manufacturer's instructions for best results and take appropriate safety precautions when using the clipper.