I don't know about "claiming" it, but you may certainly look in the mirror and read it over yourself. It sounds a bit corny, but it really is no different than praying it for someone else. If you feel uncomfortable, add the word "May" at the start of each statement... that's the gist of it anyway.
This is one of several "ritual" prayers in Scripture that you can add to your daily routine. Another is Ephesians 6:10-18, where you prayerfully put on the armour of God. Of course, there is the Lord's prayer.