I got the snap on with industrial snap press, but I agree with the others that it isn't easy! It does have a lot of support though through all those layers of binding. It is a cute top and seems to fit true to sizing for Ottobre. My DD is wearing an 86 in the photo.

Not shown in the photos is that there is a little keyhole area in the back finished with binding and closing with the snap. It is really cute. Sleeve caps are gathered, as is the front neckline. The variations suggested in the instructions are a sleeve edge gathered and then bound or finished with a rolled hem and then with elastic to gather it and make a little ruffle.