You ONLY have to worry about electricity in the monitor if you are taking the anode cap off. You only take the anode cap off to do certain repairs, so no worry there.
The deguass button DEGAUSSES. Press it if the colors are off, and press it once after each time you rotate.
I am not particularly strong and I can rotate the monitor by myself (forgot to mention that you do have to undo the remote control board when rotating to vertical, it is just sitting on two plastic pegs, just move it so it is hanging free in the cabinet while you do the rotation). On a Super Neo you do not have to unhook any of the other wiring going into the monitor, it has more than enough slack.
Mine has a marquee area at the top, all the super neos I have seen have them, although I HAVE seen 3 different marquee styles, one is dedicated Neo Geo 4-slot type, and holds 4 mini marquees, one is a BIG OLD oddly shaped marquee area, and the last one (mine) is that same big old area, filled with graphics with an insert area for a smaller marquee to go in the middle.