OK, i'm using the google change url tool and that's fine, now i would need to create the 301 redirects, could you point me to the right direction here? you mentioned i didn't have to create a rule for each year, month, but i wouldn't know how to proceed (i wouldn't even know what to search)
---EDIT---
The google change URL tool allows me to change domains but that's not my case, i still have the same domain (be-openminded.com), i just need to change the permalink of the posts.