What R6Blondie said! You'll learn a lot working with AJ!
Basically, though, when you're approaching a corner at speed, you will brake first, then downshift while still braking.
Sequence:
1. Close throttle to brakes (brake with fingertips on lever, creating a kind of arch, so when you blip the throttle while braking you won't be pulling the brake lever in)
2. Clutch lever in
3. Foot moves shifter to lower gear+
4. Blip - short rev
5. Clutch lever out (smoothly, don't dump it.)
6. Still trailbraking until happy with speed & direction
Blipping whilst braking takes practice! On that last downshift right before the corner, ease the clutch out, kind of trailbraking with the clutch.
But as Blondie said, the downshifting should be complete before the turn. That way, your body position is set, and you just need to lower your head to turn in (keep brakes on a bit past the tip-in).
Hope that helps. It's better working with someone and having them explain/demo!
Welcome!