I can get the first letdown while pumping pretty easily but I do have to concentrate on relaxing. Once the spray stops (5-10 mins for me), I turn the pump up to the fastest speed to simulate the baby's comfort suckle. I also imagine a pool of milk deep in my breasts, and envision my milk ducts filling up (I get very detailed in this and go around each breast mentally and fill up all the ducts), then I imagine the ducts releasing the milk and sure enough, the spray starts up again. I then turn the pump speed down so its simulating the longer pull when the baby would be swallowing. This can get an extra ounce or more on each side. Imagining the baby never worked for me. The whole visualization thing worked better after I looked at a picture of the ducts in the breast in a breastfeeding book so my visualization is pretty detailed!