2. Make excuses _ Lots of applicants have weaknesses in their application files, especially in their transcripts. Maybe you got low grades your freshman year. Maybe you had to leave school and work for a while. Maybe you got an F in that statistics class and had to retake it. Or maybe you got a degree in one field and are applying to grad school in a different field; or you didn't pass your medical residency exams the first time. Whatever your weakness is, do not offer excuses and do not bad_mouth anyone. So it wasn't your fault that the professor lost your final exam and flunked you, or jobs dried up in your original field of study, or you had the flu when you took the GRE. Don't say anything that sounds like an excuse or sounds like you are blaming someone else for you failing to achieve a goal. Even when it is true, it may make you seem whiny and unable to accept responsibility for your actions. Instead, address the weakness at the end of your statement, and explain how you have overcome it, learned from it, and are a better candidate now because of it.
Being an Apologist _ You do not use your personal statement to explain why you lack certain skills or experience. The point of writing this short paragraph is to sell yourself and this involves highlighting your strengths instead of apologizing for your weaknesses which in itself is a sign of weakness. The time and place for discussing flaws in your suitability is the interview and at that point, you must focus on how you plan to overcome any holes in experience/skills etc.