It kind of depends on how old the baby is. The longer you breastfeed the more your milk supply regulates and you don’t get swollen and engorged anymore, so weaning isn’t as physically painful.
If you’re weaning early on it would definitely be painful and there’s a chance you could develop an infection (mastitis) so there’s herbs and certain medications you can take to dry up your supply. Cabbage leaves on the breasts can dry up your supply as well, oddly enough.