Champs ... I really sympathise ... I have become a bit of a pumping champion, but boy has it been hard work at times! Some tips ...
As mears says, confidence is everything, the milk is in there, it's just a question of finding the best way for you of getting it out.
Often when I first started pumping I would pump for 40 minutes and get only an ounce out and was in despair. Finally I realised I just wasn't triggering the let-down and that there were various things I could do to encourage that.
Firstly it's easiest early in the day when you have most milk - even with my dd feeding (14months) the let-down takes about 20 seconds to come in the morning and up to 2 minutes in the evening. With a pump, even on a good day, it takes a good 5 minutes to trigger it.
Best to be relaxed (hard I know with a plastic pump at the boob). Some people recommend pictures of your baby - I found that actually made me think about the task too intently, I got on best when distracted by something else (e.g. TV or a magazine). Though interestingly one time I pumped in John Lewis feeding room with other babies about I got gallons of milk instantly!
Think of something about your baby that makes you laugh. I would remember something gorgeous or funny my dd had done and woosh ... milk!
Drink LOADS of water. This really makes a difference. And have some water with you when you pump - I can always tell when the let-down is on its way because I get an overwhelming desire to drink water. If you feel thirsty - keep pumping at first and then grab the water once you feel the let-down.
Alternate breasts - even if you can't get the let-down - you should be able to get a fair amount of milk out by doing 10-20 pumps on one side and then switch to the other side etc.
Try pumping from one side whilst your baby feeds from the other first thing in the morning - the baby will trigger the let-down for you and you'll have more than enough milk for the baby.
Contrary to my advice to express in the morning, I used to fit in an extra expressing feed at 9:30pm when my baby was sleeping through the night. Although I only ever got 3-4 oz out, I was relaxed, no pressure and I could pump for 20-30 mins watching the TV and stick the milk in the freezer.
Sorry this is sooooo long.