slow motion skills

[The Gecko_imp]

First of all, I can't do it .... properly and repeatedly ... yet
The CB can easily move on idle in 1st, 2nd, or 3rd (equal ~ 5, 10 or 15 mph). So the throttle isn't needed. Go in first, release the clutch, let the speed settle, start practicing your first turns. With the clutch you control speed, if you need to brake (I don't see why) that's with your foot brake - but that intrduces instability. That answers your question. one can do it with your left hand, the right hand off (hovering over the handle bar for safety). It ain't easy, but I think if teaches you a few lessons.
Nothing to boast about, just a lot of fun.

Yes, and I don't know why. Eventually it is something I do with all the bikes I own.

ending up flat on your nose ?