I have always used my trimmer to edge along driveway, street, etc. I am going to get an Echo stick edger... but a silly question... how do you keep from having the blade hit the hard surface? ie. if you are edging a paver walkway, how do you keep it from hitting the pavers and chipping a paver or breaking a blade? Also, my paver walkway was installed with the plastic retaining edging too high... it is almost at the same height as the paver in some places... will that cause a problem edging it?