proper downshifting:
1) Know what gear you're in
If you're in 2nd, 3rd, 4th, or 5th:
2) Watch your RPM (Refer to owner's manual for max speed for particular gear you're in
If within apporpriate RPM
3) Depress Clutch pedal
4) Downshift one gear
5) Release Clutch pedal
TADA! You're done....
hehe just joking around.... please don't be offended....
If you're downshifting to accelerate, you really need to know what RPM you're in, based on my little experience with my P5 it won't do me much good if I want to accelerate and downshift one gear and be in 5,000rpm range cuz I won't really feel the different if I would've kept in gear...
If you're downshifting to help you brake I guess don't try to skip gears as you might over-rev your engine and bit the crap out of your clutch....