I have frag'd several.
If its as large as your stating...WOW!
I would LOVE a frag, so do send
I'll pay you
Anyways ...I would find an area near the middle if your going for a straight cut in half frag. Cut straight down the middle with an EXTREMELY sharpe blade ...yes, BLADE. you want to do as little damage as possible. (In the wild it wouldn't matter ..why?..because levels are perfect tons of current etc) ..we dont have that luxary... anywho ... from there take a wood chizzel or something of that nature ...to the base of the animal...try and pull a little rock with it if you can (so when you move it...you have something to work with...from there ...just lay it next to another rock, or use wedding vail (I like that the best) ...tie the vail around the coral/rock ...leave it in a good place with good water flow...and in about 2 weeks you will have an amazing coral frag
Hope this helps!