We have put a fair amount of drip line in established yards. There isn't any machine yet that does this on small scale. So we use a trimmer to make the line and a simple edger to cut down to the correct depth. Then you flood the edge and simply push the line down into place using the anchors to hold it down. It doesn't take very long on small area like that. One guy on the edger can stay ahead of two guys dropping the line.