TAKE HEART - just because you struggled with the first, does not mean it will go the same way with the second. I was in your situation (difficulties bf no 1, worried about getting no 2 bf). Read all you can on all the bf threads. there are some very useful tips.
I agree with other posters. At this stage your baby only drinks a few mls - so your body only makes a few mls. Give yourself (and your body) time to adjust to bf again.
I tried expressing with ds and just could not do it. It ruined my confidence, and I ended up topping up with formula.
Now with dd (nearly 6 weeks old), I just relaxed and enjoyed her and let her feed often. At about 5 weeks she started feeding on one side only for some of her feeds, and I express on the other (really for my own comfort). At first only a couple of mls came out. Now I am getting about 60mls at a time (although sometimes it is much less - only 5 or 10mls). I pump on the "unused" breast, then on the breast she's just fed on and switch back and forth several times until they are both "empty". I do not pump every day, or even at the same time of day. I just do it when I feel a bit "full". You can combine bm pumped over a 24 hour period before freezing. I do this (keep my pump in the fridge and top it up all day if I feel "full"). I have a couple of fairly small packets of bm in my freezer, but am not fussed. These can be combined when defrosted to make up enough for a feed if necessary.
If you still have difficulty expressing in a couple of months, you may want to look at hiring an electric pump (some bf-ers swear by them).
As others have said, the most important thing is to get bf established and not worry abut expressing (which is a nice-to-have, but not essential)
GOOD LUCK