That's what I've been trying to do this last week, and FB is making it as annoying as usual. Infinite scroll and rearranging on my friends list as I defriend means that I'm clicking the wrong thing sometimes, and hover to click on a pop up menu makes it even more fun! And I keep spotting people that I meant to remove, and feeling a bit odd about removing them so long after the group removes. I was hoping that it would be as easy as seeing a nice list with a column to unfriend, but nope, it takes time/work to scale down the contacts. But it's been totally worth it, I'm happier when I check there now. :-) And happy to see more content here too!