B.,
I have always used the disposable pads just because I didn't want to have to launder the others all the time.
I breastfed my son until he was 13 months and we had a hard time in the start. I had no idea what I was doing and was almost in tears because I couldn't get him to latch on and was so engorged. Finally, after about 2 weeks of frustration we got it down, but it was exhausting. Now I know I made the right decision not to quit. I only supplemented formula with him for the first week or so and then he was pretty much strictly breastfed.
I was so afraid that I would have the same issues with my daughter also. I wouldn't be too concerned with having problems the second time. My daughter latched on 15 minutes after being born and we have been successfully breasfeeding ever since. I never had any issues with nursing her. She is now 12 months and continues to nurse a few times a day. It is so easy the second time around.
The best thing to do in order not to supplement formula is to nurse very frequently at first. I had a hard time producing milk at first with my son, but it was because I was giving him formula the first week too. The more you nurse the more milk your body will produce.
Good luck and congrats on the upcoming baby!
L.