Just hand express enough to stop the pain/hardness. Remember how ever much you squeeze out will be what your body registers as the "new" amount. Took me a good 6 weeks to stop producing but even now 7m pp I still have colostrum and leak sometimes but basically the smallest amount you can get away with to give you comfort x
I only breast fed for a couple of days, but I went engorged. To prevent mastitis I just pumped a little to relieve the pressure. Cabbage leaves also work apparently ☺️