Should I or Should I not? (an important question)

So, this is what I wanna do! 

So, I'm gonna get my haircut again soon, and I wanna do it like Joe's!! you know, short but kinda longish!! The last time I got my haircut I got my haircut like Joe's when they were on the cover of  Nickelodeon Magazine,(When it was really long, and his bangs covered his eyes, Now I want my bangs, like his ending right above my eye.)  now I wanna cut it again, just like his, my hairdresser will do it, and I know  if it's to short It'll grow back, hair grows back much quicker than nails, besides if it didn't work, then I'd be able to straighten it, and it'll be longer!!! Now I can't even attempt to straighten it because if I do, it gets freakishly long! Like, much longer than it is!! so I wanna know should I cut it, or leave it?