Completely agree with ADC.
Why are you looking to downshift? Conditions for downshifting are:
Cruising speed decreased, downshift to keep the revs up.
Going up a hill, need to be higher in powerband to prevent lugging
Taking a corner
Slowing down to point where RPM is below affective powerband, but anticipating rapid acceleration
Brake, clutch in, blip throttle, downshift, let clutch out, get on the gas to accelerate. Do not downshift to slow down, leave it in gear and use brakes as intended.
Right, that's what I was kind of expecting. And then once the RPM's drop, to downshift around the 1500 RPM mark. Again, it's been a while since I drove a stick, and I did have a lot of jerkiness in the shifting, I chalked it up to being a beginner. Now, older, wiser, more mature and serious, want to understand the science behind it rather than just the "dumb luck" smooth shifts.
So in my previous example I'm noticing a red light ahead, and I'm doing 50 mph in 4th; I start applying the brake, in gear, and then when the RPM's drop to around 1500(?), downshift to 3rd, continue braking, and when the RPM's drop again to 1500 again, downshift to 2nd, and then put into neutral when at a stop (skip 1st on way down?)... Then put into first when light turns green and start again.
Am I overthinking this? Will I not lug the engine coming to a stop in 4th (zero use of accelerator) as long as I brake, clutch in at near stop, and put into 1st, or would I stall it?
The manual had something about suggested speeds for shifting up (that's the picture from the previous post) and not to downshift into 1st above 29 mph and 2nd above 54 otherwise you get a "money shift"...