You can sharpen the raw steel by making a whole bunch of passes on the initial sharpening. How many passes you need to sharpen depends on the quality of steel. However, in the interest of saving wheels, I have typically in the past, let the LHS sharpen the skates first to establish some type of edge, whether ROH or FBV, and then I sharpen on top of that to get the FBV edge I desire.
(full disclosure: I use a Sparx now, but I sharpened for a bunch of years with a Blackstone)