The only thing you need to do with these turnouts is put insulated rail joiners on both rails that diverge from the frog and then provide separate track feeder wires beyond the insulated rail gaps. The frog changes polarity according to which point rail is touching a stock rail, and without the insulated rail joiners you would wind up with an electrical short.
You don't have to do anything to them unless they are going to face each other, as in at opposite ends of a passing track (with the points pointing away from each other). In those cases, cut the two rails leading away from the frog (opposite end from the points). You will then have to connect power feeders to each on the far side of the cuts. And be sure to fill the cuts witha small piece of plastic (don't ask me how I know).
Good luck!
I am installing old Shinohara turnouts on my layout. I am going to be running DCC. I was going to cut the rail to isolate the frog. Wire the frog to one of the tortise machine switches. is that good enough?