Getty Celtics guard Payton Pritchard BOSTON — What you see in Celtics guard Payton Pritchard is 30 yards of confidence packed into a 6-foot-1 frame. What you don’t see are the hours and years of work that transformed that belief from a Lilliputian’s delusion into an NBA champion. “If you put the work in,” he says, “you’ll have a belief in yourself that, no matter the situation, you can accomplish what you need.” “He is special in that way,” says Celtics assistant coach/director of player