how to stop pumping

Its been 4 since I gave birth. just got milk today. I just gave my son his first bottle of my milk. He's been drinking formula since the first night I had him. But I was pumping every 3 hours. He had the first colostrum and a little after when he was hungry. But I think I rather just do formula. It's just hard to pump because our room is upstairs so I'd have to go up and down stairs to put milk away and such. And I'm by myself most of the time because my boyfriend works night he's gone 14 hours then sleeps when he gets home. So I really only have his help for about 2 1/2 days. So I get even less sleep trying to do all of this. So how do I stop pumping?