Using a cheese-grater to "grate" cold butter is my favorite hassle free wait to cut in the butter. It takes just a moment and I think it's simpler than the more traditional methods. If you choose not to use the grater, simply cut the cold butter into small pieces and then blend it into the flour mixture, using a pastry blender or your fingertips.
It is entirely up to you whether or not you choose to peel the peaches for this cobbler. For years, I took the time to peel the peaches and loved the recipe like mad. About a year ago, I stopped peeling the peaches and I've never looked back. I can hardly tell a difference and I doubt I'll ever again peel the peaches for a dessert.