Thank you so much for all your stories and advice for what to do on the Raglan of Doubt. I haven't ever done a raglan sweater before (heck, let's be honest. I've yet to do an adult sweater, period) and my small (but loud) inner perfectionist thinks I Must Do It Perfectly the First Time. Which is stupid and paralyzing and even if something doesn't work, I will LEARN something from it, so it is NOT a waste of time. Do I sound like I'm trying to convince myself? Sigh.
To answer some questions:
I've tried the sweater on K himself, and it looks too big - hence a big source of my worry.
About the grey cable twist socks, Carrie asked about the pattern: it's a pattern from Hello Yarn, although I used the stitch pattern and not much else, since I a) used thinner yarn, and b) made it for bigger feet. It looks complicated but the twists are just a left twist, and that's the only complicated stitch in the whole thing. You don't need a cable needle.
Just so you know, Blogger's new version means that I no longer get anyone's email address when they post a comment - all the comments are tagged "firstname.lastname@example.org". I'd really like to answer people personally but I have to hunt down email addresses, if they're even available. I think this might push me over the edge to switch to something different.