Actually, I don't think you'll manage to do much past the first attempt, given the season.

[Oh don't worry, Sokka. Lily's quite sympathetic to the current plight! Which is why she's not actually going to make you suffer more than this one itsy-bitsy test of sorts.]

Tell you what; you can even have your boots back on, along with the coat. It's just hard to do this one thing with fabric, what with friction and all that. I'll show you what I mean when demonstrating what you'll do.