My Gynecologist explained to me that the problem all women have with pumping is that results are temporary. When pregnant, the breasts do swell, but if not pregnant and you stop pumping then they... "unswell". This leads to what is called "ptosis" or sagging breasts.
There are numerous articles and websites dedicated to breast pumping and achieving lactation. They all require the proper amount of hormone levels, including estrogen, progesterone, and others. Many also recommend a galactagogue (which helps improve milk production) such as Domperidone, which is not available in the US. It can be purchased and shipped from a Canadian pharmacy legally with a prescription.
These sites also warn to use the correct size of nipple flange and to not use high suction as this can lead to damage of the nipple and breasts tissue. Anecdotal stories of succes are fine, but I urge anyone with interest in this to do some research and study what professionals say about the proper way to do it. Doing it the wrong way can lead to damage and related issues plus less than satisfactory results.