i Checked the propogation articles, couldnt find anything about leathers. However I ran across an article about elegances, and I thihnk I can keep mine now and it will survive.
Any help possible, like a link would help. Sorry I couldnt find it, I look at all of the links/articles in the thread and didt see anything about leathers/removing them form live rock.
If you don't mind one growing back in the same location, cut it at the base, then sew it to a rock in it's new location using fishing line. It is better to cut a leather out of the tank. If you do it out of the tank, you could scrub of any remnants of the original base.
Yes take a pair of sharp sciccors or an exacto with a new blade and cut the base, be sure tto clean whatever you use with alchohl first as new blades have a thin coat of oil on them to prevent rust. Leathers can slime a lot when cut, so it's better to do it outside the tank if possible,but not absolutely necessary. The piece left on the rock most likely will grow a new coral.