Trimming a nail when you can’t see the quick is harder, but not impossible. I can’t see the quick on Powders nails either, so what I do is I trim it a little longer than I do Stickers (since I can see her quick easily) and I have never made him bleed. Since his are long, the quick is going to further out than normal. So you’ll need to do more frequent trims to avoid making him bleed until they are down. Or, you could take him to a professional and they could show you exactly how much you can cut off. If you do it yourself, keep styptic powder like kwik stop on hand, then if you do cut too far you can just dip his nail into the powder and the bleeding will stop.

I don’t use a trance. What I use is holding the bun to my chest, with my arm supporting the back legs, my chest supporting the side/back and my hand around the shoulder blade area, which keeps mine from freaking out. If your guy is not calm enough to just be held, you can use a bunny burrito (wrapping him in a blanket, it’s shown in the grooming FAQ section). Different methods apply for different rabbits, figure out what is best for yours.