Hire an Experienced Attorney
The first step to erasing your criminal history would be to contact the American Bar Association and find an attorney experienced in expunging or sealing criminal records. The lawyer also needs to be located in the jurisdiction where you were convicted of a crime.
Go to the court where you were convicted of a crime and petition to either have your record sealed or expunged.
Go to court on the date that's been scheduled. You will have your case heard by a judge, once the appropriate paperwork has been submitted. The judge will review your case to determine whether he will have your criminal record expunged or sealed.