My Harrison Owl call just came in the mail. I was wondering for those of you that own one, how do I use it? It didn't come with any instructions. I know the when your trying to sound like a laughing owl, your suppose to roll your tongue. I can't roll my r's, so any advice on how to roll my r's. Would really like to learn how to roll my r's, cause it would help with my goose and duck calling. Thank you!