I’m not to sure about the first one but I think it’s fine if you listen to some music to cancel other noise if that’s what you are wondering. But for the second one, yes of course you can mix methods. Methods are just like a Guide to help you get to your dr. There trying to make it simpler or/and easier. And if you need to change it to help you and make it work the best for you then do it! Btw lots of people mix methods. I really hoped this helped ❤️