I've done a little hand grinding on carbide with diamond wheels. It seems that most wheels are too coarse to make a nice factory quality edge. Under microscope the edges tend to be fairly chippy and not very durable as a consequence (too many crack starts). I suspect that carbide is professionally finshed with very fine abrasives. You can get away with some hand grinding, but you won't get a very durable edge. It is handy for making quick lathe form tools though.
Do wear respiratory protection when grinding carbide. The grinder dust has particularly bad respiratory issues. I do any of my heavy grinding (say cutting a 3/4" boring bar shorter) outside wearing a respirator. I protect myself with the respirator and try to keep the workshop clear of the grinder dust because it's terrible abrasive stuff that you really don't want floating around.