Ah ha ha ha ha! I just about wrote "Tips for pimping" Not pimping. Pumping!

I've got to get a bit of milk in the freezer for my little man. I'm going to be coaching a friend's labour any day now, and won't be able to nurse my little guy while I'm at the hospital. And I'm having a terrible time getting anything with the pump! I've been taking him in the bath with me, relaxing, nursing him on one side while pumping the other. I tried just pumping, but couldn't really get a let-down. With him on one side, I get some let-down, but only about 1-2 ounces, if I'm lucky. I know I've got enough milk - baby is growing FAT! But I just can't seem to pump it.

I really need to have some milk set aside ASAP! I'd appreciate any tips or help you could give me!
Thanks!