SCh, Go to the hardware store or the lawn and garden section of a department store and get one of the folks who work in that section, and tell them what your looking for. Tell them that it is for you and you need something powerful enough to get the job done, but something that you would be able to use with relative ease. Have them explain how to replace the string or whatever it uses to cut the weeds. They should be able to help you.
Let us know what you get and how you like it. Good luck!
