Mikeman thats correct to a point. some synchros in the old transmissions, made it hard to shift into gear or grind if you shift fast, and sometimes it was necessary to double shift to avoid grinding. I found it to be easier to shift into certain gear with H&T if your synchros are beat up from abuse. Said all that.... if you become really good with H&T you can skip the clutch all together, and power shift allowing you to shift much faster. I never done that in my porshes but used to enjoy doing this in some of my older cars on the track and the street. I would suggest you learn H&T in an older car if you have one, and of course providing the peddals are arranged favorably. In some of the cars, the peddal placements make it so hard or impossible to do H&T smoothly. As others said, the place to learn H&T is not on the track as you are overwhelmed with so many other issues, and one can practice that on his or her own during everyday street driving. Good luck