0:02---note how you push your heels around, more so on left turns. We don't want to do that.
Still 2 seconds--note how your weight is behind your heels. We don't want to do that, either. Around 21-23 seconds note how light your ski tips are. You need the front half of the inside edge of your outside ski engaged in the snow to turn you.
Don't try to do just that; follow the book.
Your skis diverge. Too much weight on the inside ski.
You sink during the turn, then extend to make the next turn. Old bad habit that is tough to break.
Go through book #1 step by step. Don't move to the next thing until you're getting the current movement right. Think of one thing at a time. Don't go on to another movement until you have a good handle on the first, then add just one. Get a good handle on both those, then add the third. Don't try to do too much on one day.
One drill I find very useful, on an easy slope, is to traverse, say, left. Lift the tail (only the tail) of the right ski about an inch off the snow and tip it. Tip it more and more, hold the tail that inch above the snow and
let your left ski turn you right. You don't turn your ski; your ski turns you. Keep both ski tips about even as you do this. Now put the right on the snow, lift the left ski tail an inch, tip it, tip it more, and
let your right ski turn you left. You need more drills than just this one. Go through the book. Perfect practice makes perfect.
If your boots don't fit like an exoskeleton, budget for new boots at next September's sales, if not sooner. (Spring sales are often more about the shop selling you anything they can to clear off their shelves rather than what is best for you.) Pull the liner out of your boots. Put your foot in, all the way forward. If you have more than about 5/8" (max) of room at your heel, they're too long. If you have more than about 2 mm on each side, they're too wide. A couple of tips to snug up your boots--put a
Bontex insole shim under your footbeds. If your boots are still loose, try a
tongue shim to hold your foot down. Avoid heel lifts. Maybe try the pads on the outside of the liner to make a better heel pocket. These only work for boots that are very close to fitting, not for boots that are just too big.