My experience was 10 years in the past so I’m sure things have gotten better but here goes. Electric breastpumps are a LOT faster, and go for the double. It will cut your pumping time in half. Think of being at work, which would be better, taking a 10-minute break or taking a 20-minute break?
Is there a hospital in your town? I ask because some hospitals have breast pumps for rent. You purchase a kit that has various hoses and other attachments that you can keep–the one I got came with a manual pump as well, and several bottles for collection. Then when I was through with it I gave the mechanical part back and got my deposit back. If the hospital has such a thing, it might also have someone who can offer some advice.
If you’re pumping 4 oz in addition to feeding the baby I’d say that’s good. It’s been 10 years, I think I pumped more (when I was at the office) but that was replacing a feeding.
My office had a kitchen with refrigerator/freezer so I immediately froze the collected milk (or anyway I stuck it in the freezer, it didn’t always freeze by the time I left for the day), and I lived close enough to work that I didn’t worry about it getting too warm on the way home. But you can buy kits made to chill it and keep it cold if you need to for longer periods.
You still need to wear nursing friendly clothes, obviously. Dresses that zip in the back are a bad idea. (At any time, actually.)
It was a hassle, though. The first day I went in, and right off the bat there was a voicemail from the nanny, who couldn’t figure out how to get the cap off the bottle, and in the background my baby was crying. So much for that silk blouse.
You also need the understanding of your coworkers. In my case I had an office and I had a door that would close. I also worked with a bunch of clowns who thought it was a lot of fun to stand outside my office door and go, “Moooo!” It was all women in my office, by the way, and most of them had been through the same thing. It really helps if you have a place where you feel comfortable and where you have some privacy. In fact it more than just really helps, it’s almost essential.