I pumped for 10 months before my baby came home. But I refused to pump more than 6 times in a day, because I already had one child, and needed to be with her, and do things with her.
I agree with Bella, that you need to consider very carefully how long you are willing to do this. At the very least, wait until you are approved. I made the mistake of starting the protocol before we were approved. So, I wound up starting to pump only a month and a half after we were approved. I stayed on the protocol for 8.5 months, because we didn't have a situation lined up, and I thought there was no sense in starting to pump before necessary. So, if you can, wait until you are approved, and don't be afraid to stay on the birth control pills for 8 months, if you don't get a situation before that.
Then, don't pump too much. It is a lot easier to add pumping sessions, than it is to take them away. I know that if you start out with say, 10 sessions, then start pumping less times per day, that will negatively affect your supply. So start with the minimum of what you can stand, and then increase from there, if you want to. Until you are matched, then pump like crazy! LOL Seriously, though, every 2-3 hours at that point would be good.
When I was pumping, and was well established with my routine, I would sometimes skip a session. I would pump at
8 AM, 11 AM, 2 PM, 5 PM 7or8 PM, then 10 PM. I would try not to skip the same session two days in a row. So if I missed the 11 AM on Monday, I would try not to miss it on Tuesday. Although it did happen sometimes. Sometimes I would take Daphne and her cousins to the zoo, and would pump at 8 Am, then wouldn't get to pump again until 3 PM or so. It was fine, as long as I didn't do it every day. The key is to not make yourself crazy about it. It's kinda like scheduling a bathroom break, but it takes a little longer.
Weekends where we were out and about made things a little hectic sometimes. I brought my pump and the car adaptor, and that helped. There were a few times that I only pumped 3 times in a day. That didn't happen very often, but if it did, I didn't sweat it. After all, one day is not going to kill my supply.
Anyway, come back here often, and ask all the questions you want. That's why we're here!
Good Luck!