When I was applying for residency I used this really great book to write my CV and personal statement. The author is J. Tysinger and the book is "Resumes and Personal Statements for Health Professionals." A great book - it helps you develop a thought process and approach to writing a personal statement as well as gives examples of CVs and essays.
It's available at www.medsite.com, if you are interested.
I hope this helps... 🙂