Once you have completed your CV, check it carefully before sending it along with your application. One single misspelling or misused word is enough to make your image as a methodical person collapse. You can also ask a friend for help: other people will see mistakes you miss.
Likewise, be extremely critical of your CV as to its style and contents. If you were one of the referees called to support your application (and consequently your CV), how would you react? Which aspects of your CV would look weakest? Which section(s) would you modify? How would you do it?
You can find a lot of CV templates and examples on the Internet, in which you can identify some effective solutions, just as you might find it helpful to compare your CV with those of your friends.