Its really hard at first.

DD would chuck some major ones, my SIL said when your at home just hold her and say its ok, its ok.. Well yeah that didnt work.. she got louder and louder.. Now I just get down to her level and tell her that if she wants something she has to explain it to me. I let her scream and jump up and down and then she started running up to me and saying sorry..

I remember once she screamed so much I sat on the floor crying..

Now.. Dont ask me how we got to this place but I make her have a 10 second time out. I say now we have to stop crying and count to 10. She has time to breath and re think.. (as do I)

As for the shops still working on it. I tend to tell her we are going to leave and go home if she doesnt stop. She stops for a little and then starts again.. But Im liking the idea of taking her to the car..

Oh and I always always make sure she has eatten and slept before we go to the shops.. Sometimes thats the best trick..