wear ur nose out of ur scarf/bandana then breath through ur mouth and out ur nose then you get no mousture build up on ur bandana and your nose does't get cold because of the warm air coming out of ur body
it takes practice but eventually it come naturally when skiing
my goggles never fog. keep them on your face all day, and make sure to not breathe down into your jacket. the warm air rises up into your goggles and also just gets more condensation on your jacket/face which then freezes. suck it up and leave your face exposed. if it's really that cold that you need a face cover, your goggles shouldn't be fogging.
but don't breathe into your jacket, that's probably the easiest way to prevent fogging.
forreal though, you can tuck it however. i usually leave the bottom hangin out cause i think that helps, but to be honest the best thing ive seen that you can do is not to mess with it. put it on, leave it on, dont keep switching. if it gets too messed up and gross, put on a new one, they cost like a dollar.