If you don't have a food processor, you can use a pastry cutter or hold some butter knives wolverine style and cut your butter into your flour mixture. Once the flour/butter mixture is in pea-sized crumbles, slowly drizzle milk into the mixture and stir to combine. Stop mixing as soon as all the dry ingredients are incorporated - the dough will be really sticky - do not over mix or handle the dough too much, you don't want to melt the butter.