I never trim muffs even if they're seeming the be in the way, but honestly, crest trimming is something up the the owner. I don't think there's a "right" way to do it. My GL hens I got from a lady who trimmed the whole front half of the crest, mine I only trim the little section that comes down directly in front of the eye socket and a few frontal feathers that get in the way during the summer. When fall comes around I trim back further if the crest is bigger, but never go half-way. I must say, I'm lucky to have such well mannered Polish, because I've no help when I do it, it's just one hand of mine holding the Polish, the other doing the scissor work which is quite dangerously close to their eye, and, I've never had troubles or incidents.
I'll get pics today, some in detail if I can.
I'll get pics today, some in detail if I can.