That is some impressive moss LWB. If Java Moss had ever looked that nice for me, I might actually like the stuff. I can see why you're having such a dilemma trying to figure out how to approach that monster.
I'm not particularly good at trimming moss, but here's what I'd do. First remove the moss from the tank and place it in a bucket or rubbermaid container filled with water. This will help to control any small fragments that escape so they don't attach where you don't want them. They you can either gently pull off the excess, or use a pair of scissors to trim. Create nice sandwich sized piles and then send to all your friends. When done put the driftwood back in the tank and watch your fish explore the new swimming space.
I'm not particularly good at trimming moss, but here's what I'd do. First remove the moss from the tank and place it in a bucket or rubbermaid container filled with water. This will help to control any small fragments that escape so they don't attach where you don't want them. They you can either gently pull off the excess, or use a pair of scissors to trim. Create nice sandwich sized piles and then send to all your friends. When done put the driftwood back in the tank and watch your fish explore the new swimming space.