Skate sharpening is NOT a do-it-yourself project! Skates are expensive and it only takes one bad sharpening to turn them into scrap metal!
Take your skates to a pro shop or ask some regular skaters at your rink where they get theirs sharpened. Skates properly sharpened will have a smooth concave grind accurately centered along the length of the blades, edges squared (parallel to the bottom of the boot) and level with each other (inside edge at same height as outside edge) for the length of the blade. Proper sharpening will maintain the correct rocker for the life of the blade.
Beware of how some shops do their sharpening: Some shops flat-grind the blade first, and then hollow grind. This wears the blade at an accelerated rate. Also be aware that some sports stores sharpen blades using techniques for hockey skates, which are not useful for figure skates and it can take only 1 bad grinding to ruin a pair of expensive blades.
