I converted the c80 rail that came with the turntable to ME c55, and it really wasn't that hard. There are two wires, one soldered to each rail for power. I simply unsoldered the two wires, slid out the c80 rail, replaced it with c55 rail, and resoldered it. My biggest worry was the delicate plastic railing along the bridge. I didn't want to inadvertently touch that with the hot iron and melt it. So I took a wet rag and draped it over the railing and it worked.
One thing I will mention is make sure to remove as much of the solder as possible before sliding out the rail. Otherwise you will run the risk of breaking the little spike heads that hold the rail in place.
Also, the thickness of the lip of the pit is a bit thicker than the thickness of ME ties, so you will still need to shim up your approach tracks a little bit.
Good luck,
Scott