All the advice above is awesome! I'll give you my 2-cents in case it helps.
I've got a 7-week old and began pumping during our 12-day stay in the NICU, so I had a ton of lactation support in getting started (very helpful!). Though he does breastfeed now, I still pump at least once a day to build up a supply for when I'm away.
Thus far, here's what works for me...
- technique is important... rapid pumps until the milk begins to come out, then slower (3-second holds) from there. Sometimes I go for a 5-second hold if it's really coming out well.
- per La Leche League... massaging the breast in circular motions (like a breast exam), followed by gently strokes, followed by leaning over and shaking the breast, will encourage let down more rapidly. I've also found that warm compresses help.
- pumping at night: my son tends to only feed on one side at night before dozing back off, so I take the opportunity to pump the other side which is typically quite full.
- though I have a dual sided electric pump, I only use the manual one as it seems to be just as effective and quick when only pumping one side (night pumps take 10-15 mins max). It also helps that it's quiet enough to use in my bedroom and/or right next to baby.
- occasionally, after pumping the full breast, I'll return to the one from which he fed and completely drain whatever is left there (typically 1/2 to 1 ounce).
- definitely practice emptying entirely (or as close as you can get) -- it really does help to increase supply.
All that said, hands down the best advice I ever got... don't stress out over supply. Whether that be building your supply for storage or having enough to feed your little one after pumping. Even when your breasts feel empty to you, chances are that the baby can still get a bit of milk out. And, if not, simply use what you've pumped. No harm no foul, just good practice.
Otherwise, keep up the good pumping and breastfeeding work and the milk will come!
Good luck!! Oh, and I totally agree that the Lansinoh storage bags are the best.