Yeah, the hedge trimmer can be sharpened by hand. To sharpen the hedge trimmer blade
there are many tools on the online market such as amazon check now that help users to easily sharpen the trimmer blades.
Tools you will get on a low budget as well as use forever.
This thing if you buy takes on low cost otherwise if you want to go with hedge trimmer blade sharpening service
then the Cost to sharpen hedge trimmer blades between $15 to $30 for the electric and gas hedge trimmers.