I have never found sharpening to be that hard. I am not talking about bent or chipped blades, but if you stick to sharpening the side away from the ice, you can bring it back to a new edge with little trouble. I started about 2010 with a set of cardboard grinding/sharpening wheels I bought from EBAY, and have sharpened my 6 inch mora, 4 inch mora, and 5 inch Lazer blades probably 10 times in total. If you have old eyes like me get a pair of Harbor Freight jewelers loupes to see the burr, and once you see a burr glinting all along the ice side, you are done. No need to strop the burr off like you do when sharpening knives- that just tempts you to touch the ice side, with is about the only way to screw it up. I got one of those Workshop belt sander sharpeners, and is works as well- I even could get in and sharpen my 4.5 inch Nils, which was impossible with the paper wheels.
If you are going to send them in anyway, it costs you nothing to try. I did not find it hard at all.