To shift without the clutch you match the RPM of the engine with the RPM of the transmission input shaft so the gears mesh smoothly. If you want to do it by the numbers, note the RPM difference between gears and try to match it, but usually one just does it from a seat-of-the-pants feel. You do need the clutch to start up from a stop in first gear (unless you are on a downhill slope or someone pushes you).
See this guy's YouTube:
https://www.youtube.com/watch?v=jLw0hAtOik4
When the rubber-centered clutch disk (what idiot designed that?) went ballistic driving around Mt. Rainier in 1994 I got an opportunity to practice this on the 150 mile drive home.
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1988 Silver 924-S Original owner
Porsche 924S: The 944's cheaper, faster little sister.
