Power Pumping Tricks

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I am 3 1/2 months postpartum and was EBF until 2 months. I am hoping desperately that I will be able to return to this. I have had so many problems breastfeeding and I don’t want to get into all of them but I am at the point now where my supply is extremely low. Yes, I know this for sure. I am going to try power pumping. Does anyone have any tips or tricks? Success stories? How long did it take for power pumping to show an affect on your supply?