The 10 Hardest Things To Change In Life #8: Email addresses. ... #7: Last Names. ... #6: Relationships. ... #5: Banks. ... #4: Zip codes. I don't mean just changing the 5-digit number in a mailing address. ... #3. Careers. ... #2. Hearts and Minds. ... #1: Yourself. Even harder than changing other people's minds is changing our own minds. More items... Nov 18, 2014