knife, cut, secure...not much to it...some use a scalpel, some use a razor blade...either way it is a easy coral to cut up...then either use an elastic to hold it to a piece of rubble or sit it in a tupperware container in low flow with some rubble it will attach fairly quickly..
i inadvertently fragged mine a couple times with just an elastic band around it, trying to get it to attach to some rubble...they heal and attach very quick in good water..