Easy to follow guide. Make sure to read all directions especially section 8! Maybe even check the comments at section 8 to make sure you don't mess your equipment up. Other than that it was a simple job using ifixit kit and took about 20 min. The optical drive works as an external drive. The old HDD is installed as a backup drive and the new SSD is installed as main boot drive. Good luck!
I applied pretty firm pressure and was very careful with my rotations. They both came right out. I noticed the left longer screw was sort of tight on the first initial turn or two but after that it loosened up. I didn't have any slip on either screw so I can't speak for striping but I can say it was either because I applied firm pressure (as the instructions say to do) or because lock tight had worn off.