Borderline. Many sessions will i need?

Hi, I am assuming that your diagnosis is given by a Psychiatrist after history taking and Psychological tests and not some random internet test. Now that you have been diagnosed with Borderline Personality disorder you may be given medication for symptom control, mainly depressive symptoms, aggression or mood swings. However for long term improvement in the disorder you will need Dialectical Behaviour Therapy(DBT) and maybe combination of some other therapies as decided by your  therapist(Psychiatrist or Psychologist). Minimum 8 -10 weeks sessions are there for DBT alone. However you can check for Marsha Lineman's DBT worksheets online. They are available as a PDF, they are self explanatory and you can do those on your own,  if motivated enough. They would mainly be mindfulness exercises and other techniques to help you gain emotional control, impulse control and improve your interpersonal relationships and self -esteem. There are also some books available by Marsha Lineman , she is the pioneer in DBT , you can check these out if you wish. Along with that you could visit a Psychiatrist who has experience with Borderline Personality patients or a Psychologist who has similar experience. With determination and consistency you can definitely become much better and lead a happy, fulfilling life. Hope this helps, All the Best!