Well, now I see where the "danger disaster" part of your name comes from
"if it doesn't hurt it's right" is NOT TRUE. as a matter of fact, that's DANGEROUS ADVICE for exactly the reason you just pointed out, someone may think "oh, it didn't hurt, I'm doing it right" then try it from a drop or on conrete and get injured.
If you're doing it right you're doing it right, there are plenty of people who can help, in your area or who you can send a video to.
As for "Many ways of rolling", I've yet to see anyone show me a significantly different way. (diagnol rolls and straight rolls are two) I'm curious,
PLEASE back that statement up with something. I'm not, and I've never, said there is only one right way to do something, but there can be a "Right way" and there are definitely "wrong ways" ... there is nothing bad about the fact that there is a right way to do something. Humans have been rolling for thousands of years, martial artists made a study of it and learned some things, why not take thousands of years of OTHER PEOPLES PAIN and learn from it?
Now, as for the hands up / down issue- there are some people who tell you to put your right palm down ... I tell you to try it, get on your knee, put your right palm facing down, now tell me how you are going to transition smoothly to your right shoulder? It doesn't make sense
to me that way.
No try it with your palm facing up, see the difference? One way "braces against" while the other allows you to be supply and round. fo rme, if you put your palm facing down IT HAS TO TURN OVER at some point, and I feel that putting it down sets up a bad angle and bad form in a roll.
Again, nothing is right 100% of the time or for everyone, I just tell people the best way I know.