When spraying do you spray the lawn or the perimeter of your yard to keep bugs away.

If the perimeter has bushes, trees etc, spray them first. Spray or rather fog the lawn with any breeze at your back. Best ttime to fog is no wind early morning or late evening and make sure that all windows are closed. The unit really throws a big cloud of fog. If the wind is coming from the west start at the western limit of your property. Works great, follow unit instructions.