Second time moms

Do I really need a breast pump? I have one from my first but need to get replacement parts for it and am considering not getting them unless I really need it. Breast feeding my first was awful, I was so uneducated. I went from breast to pump breast to pump right away and killed my supply to where I basically was forced to pump because my daughter didn't always want to do the work. I also had to supplement some and had no idea of how to increase my supply. This time around I'm a little more educated. I want to EBF and not introduce a bottle until she's a couple of months old if at all. However it's been a while and I don't remember if I need a pump for when I'm engorged or if my body will regulate? I don't want to risk having a low supply again so any input is appreciated!