Like everyone has said, what works for some won't work for others and all bb's are different lol!

I felt like I needed to be prepared for anything and so I bought an Avent manual pump which came with 2 small bottles. I left it in the wrapper thinking I wouldn't need it but ended up using in on day 8 after DD was born because my nipples were so so sore and I couldn't handle DD sucking anymore. So in my case I was so glad I was prepared and I could just whip out the pump to gently express while my nipples healed! DD was fine going from nipple to teat and vice versa. I never had an issue with that pump (and 2 of my friends have since borrowed it and then bought one!) but have also heard great things about Medela.

Great that you are going to a breasfeeding class, I'm sure that will give you a head start. And don't worry about it all too much hun!