anyone exclusively pump?

Kr
I'm pregnant with my second and I EBF my first but I'm wanting to just exclusively pump and bottle feed this time around. I'll probably nurse while in the hospital and maybe a few days after. How hard or easy was for you to maintain a supply? How long did you pump for and supply baby with breastmilk? I breastfed my first for 2 years (she would just night nurse after a year to go to sleep) but I want to atleast try to keep exclusively pumping enough milk for a year!