Gave it a shot, with limited success. I felt pretty good for a few seconds after "powering up", but went back to normal pretty fast.
I think it's probably possible to bolster your emotional state to improve performance for a few minutes. In DBZ it was Goku's extensive martial arts training that allowed him to approach this state, and it was his rage over the loss of his friend that threw him over the edge. Maybe if you trained hard enough and were scared or angry enough you could transition into a higher state of awareness, get in "the zone" if you will.
Of course, you probably won't transform into a golden-haired, green-eyed, glowing superman. I certainly didn't, but I'd prefer red hair and gray eyes anyway.