This Too Shall Pass!
When my milk first came in, it came in with a vengeance. I was shooting it everywhere—like water guns on a hot summer day—drenching my shirt, covering her face, making her cough, and giving her stomach pains. My husband thought it was hysterical. Me...not so much! It was painful, upsetting, and hard to manage. It took some time, but I was able to find ways to control the initial let down and save my baby from a milk face mask every time I nursed.
I used hand expressing to get things started, then caught the spray in a burp cloth (or, even better, a letdown catcher like the haakaa) before putting baby on the breast. It's a learning process, but once you get the hang of it, your milk settles in and it doesn't happen anymore. I guess that's the lesson of parenthood: you can do hard things, and this too shall pass.