Not everyone can do what Neville could do to go to silence. This is why we should all examine ourselves. One of the constants in all the ancient texts is go have a drink, go have smoke, go smoke a doobie. What happens when you do that? You relax and gel.
We do that as we watch the boob tube too. If you have a hard time going to silence understand it just means going into your head. Now that you know what that does you determine which consciousness you are using and flip it until it becomes natural.
Then you go live life and if caca happens you will know you allowed something in there that is not worthy of your attention.
I hope this helps and blessings to you!