Those are gorgeous colors!
Intriguing, I do mine without any tools, and yes they roll around ask me how many are under cabinets haha! I basically do what Lorraine posted. Actually a combo of what Lisi and Lorraine posted.
What I'm wondering, I know Lisi was on a HH for awhile, myself also. So, wondering if those that 'can't' by hand didn't work very long on a HH or not at all?
I think it teaches you patience for one
but also since it's not as hot and 'slower' so you learn heat control and gravity, if that's a factor? I mean, glass wants to be round (ever make a barrel etc and heat too much it starts to round up?), so it's natural once you find that aha factor. As far as even size, I do graduated sets and same size, but again as Lorraine posted, I go by how many wraps I do basically.
Not downing those that do, whatever speeds you up, I'm just an insomniac thinking aloud.