The Merrimack slides past Hooksett wide and unhurried, and out on the rail trail by Heads Pond you can hear a mower going somewhere behind the trees most Tuesday mornings. Mostly Mowing does what the name says and does it steadily: weekly cutting, string trimming around trees and posts, edging where lawn meets pavement, and blowing the walks clean before leaving. There is no fuss to it, just show up, cut it even, and leave the yard better than the week before. Spring raking clears the winter grit and fall work handles the leaves that come down thick along the river. Straight lines on a summer lawn are a small pleasure, and they hold up all week.