Can I use a bed redifiner to cut in new edges? Or are they only good for recutting an existing edge. I just had a shed built and need to build beds down the side of it, what's the easiest method to get all the grass up so I can plant shrubs and mulch. till it? Or just dig it the old fashioned way. I am halfway looking for a good reason to buy a bed redifiner but only if it will help with this job.