You can change it with a Japanese account but it will only show up changed on you're screen. For friends, it will be the name that you first made. It kind of sucks, since I hate my PSN name...
Puppy yeah that's no fun
Hopefully we will someday be able to change them.
Unfortunately you can not. To create new psn name you need a new account. I don't like that cause I've been wanting to change my psn name but I don't wanna lose all my trophy info. GGGRRRRRR.......
You honestly like skill321? I mean if it has some sort of unknown value to you then fine. I want to change my username but I don't want my friend's list to be full of random names I don't know because they change them all the time.
EDIT: Also Welcome to the forum! Hope you enjoy your stay.
Just make a new account. It much easer that way. You can delete your old one of your ps3, butt it still in the system. Then the only thing is you would need a new e-mail account for you new psn account. I did that with my account awhile ago. Now my son uses my old account. We each got one now. This way there is no mix up's with our trophies and stuff.