Understand one's own personality will help you to regulate it better. Every personality will have its good and bad, strengths and weaknesses. Once you understand yourself, you will be better equipped to nurture your strengths, accept and manage your weaknesses.
For example, if you are a bit of a worrier and a perfectionist, there is good and bad in that. Most high achievers are actually anxious and perfectionistic individuals. One can also view an anxiety trait as a very powerful tool. However, one do need to foster its strengths and manage its weaknesses.
A perfectionist who is self critical and fear failure will naturally be very prone to stress. A perfectionist who has a better understanding and acceptance of self, and who is self compassionate and embraces failures, will probably do very well!