When you have asked your questions (step 1), found the evidence (step 2), and critically appraised the evidence (step 3), it is time to implement that evidence into your practice. The research based evidence should be integrated with your own clinical experience and expertise and the patients' preferences.
Implementation of evidence into practice may be challenging. Description of different implementation strategies can be found in these books:
Greenhalgh, T. (2010). Getting evidence into practice. In Greenhalgh, T. How to read a paper (4th ed., pp. 199-220). Chichester, West Sussex, UK: Wiley-Blackwell.
McCluskey, A. (2009). Implementing evidence into practice. In T. Hoffmann, S. Bennett & C. Del Mar (Eds.), Evidence-based practice across the health professions (pp. 318-339). Chatswood, N.S.W: Elsevier Australia.