To OP: Buttering on your back foot is harder than on your front foot, you need to lean back and pull up your nose with your front knee.
I have a quick question about these boots as well. I just bought a pair today and sized down a full size (size 9 shoe so size 8 boot) and they boots are fairly tight (toes almost scrunched) on me without having ridden them.
My question is will they pack out enough to be comfortable or will they not stretch out enough? I ride about 10 times a year, but hike my backyard setup whenever I can, like every other day. I also like a medium flex boot, nothing too noodley. I know the libertines are sort of soft but if I am wearing a smaller size will it really matter?