Purify yourself as much as you can. You know that only the "pure" are entitled even to touch the Quraan. You know that your body, dress and place should be clean. You also know about the purity of intention. But you should also realize that the purity of heart and body from sins is equally important. No one can be completely free from sins; but try to avoid as much as you can. And if you happen to commit some, try to turn to Allah in repentance and ask for His forgiveness, as soon as you can. Also take care that, while reading the Quraan, you are not eating haraam, wearing haraam, living in haraam (obtained through means not permitted by Allah ). The purer you are, the more your heart will remain with you, the more it will open itself to the Quraan