Advice on Glue and Coral Skeleton Base Trimming

[CaptainYooh]

Let me get this straight: I have a double–tube syringe of Epoxy glue. Do I just insert it in the crevice and squeeze/push glue out into the crevice right there in the water? And then, cover the coral skeleton with epoxy while in the water and insert the skeleton in the crevice? Or does this method require a piece of small "base rock" to make a real frag? I am not sure I understand. We wanted to glue the coral skeleton right onto the live rock.

Also, what about my skeleton trimming question, guys?

Please and thanks.