Hi,
as with any interview I would suggest to try and bring your positive things forward, yet be honest. Thus you could mention what you have done and explain why. If your "mistakes" have been spotted (which does not have to be the case) you can explain that you have learned a lot in the process and that you are now aware that...../as a result you will..... etc.
Stressing that you are learning and able to adapt seems to me important.
Good luck