Miguel,
Yes, I rehearsed with a few hundred practice sessions...
S&S off and on since June 2014. If you look at the oldest video on my youtube channel (S&S swings & getups, Sep 2014), you can see I've come a long way. And, thank you for the kind words!
Yes, halos should go as deep behind you as you can manage, really letting the bell drop as low as you can behind your head and all the way around, to open up the shoulders. I can do much better halos now since I've put more focus on them and other T-spine mobility work, but I imagine others can do better still. I think doing them a bit slower than what I'm doing there is probably recommended, too.
Goblet squat... I don't know if a wider base is better. I do what feels right and opens up my hips. I suspect there is some gender difference there. I mean, I've carried a baby with my hips, where you guys probably haven't... haha. You want your knees to track your toes, wherever they are. Pull yourself down to lower your pelvis between your legs, not on top of them. Think of moving your femurs OUT. And PRY, like you are prying a fence-post out of the ground, as Pavel describes in S&S. This is what loosens the fascia (I picked this up from the Tim Ferris podcast w/ Pavel). I like to use one of the squats in each set of 5 as the "prying" or moving around squat to increase the mobility. The others are just regular goblet squats to warm up. But it depends on how much mobility I need that day; sometimes I hang out for more time in the bottom, seeking more depth and range of motion with the prying, etc.
The get-ups may not be perfect; I think Steve was referring to the weight (24kg) being above the women's Simple standard of 16kg. For certification standards, "the heel of the foot on the kettlebell side stays planted during the low sweep, the lunge up to standing, and the reverse of these actions." I'm not sure if all of mine meet this standard, but I try to. Other than that, you can move the feet as you need to, but always seek smooth transitions. As for shoulders, keep them packed... maybe post a video of your get-up?
You're welcome, and thank you!!