I followed the guide, and did not have any problems replacing the display! I bought the new display on ebay for around 250 EUR and the tools from ifixit for around 40 EUR(with shipping costs), so I kinda saved myself 600+ EUR at least. Thanks Ifixit :D
Guys, be very carefull with these 3 cables.. If you are not going to replace the whole display, just be careful as much as possible.