Total noob here, so bear with me. Never had these when I was a kid, but I am going to get one for my daughter's birthday coming up. I understand they need to be broken in, and have read as little as 100 swings off a tee to as many as 400 swings progressing from a tee, to soft toss to 50% pitching speed to 75% pitching speed then 100%. What say you veterans of softball (or baseball, is there a difference in approaches?) bats? How do you know when a bat is broken in, and what is the best/most efficient way to go about it?