INSTALLATION:
0) Backup your app data, messages, contacts etc... it's your responsibility.
1) Download ROM zip file, MD5 file (not necessary) and GAPPS; put them on your phone,
2) Make sure you have fully working recovery. Recommended is TWRP 2.8.7.0, maintained by nerdyblonde (big thanks!)
3) Go into the recovery, make a backup first, then wipe /system, /data, /cache & dalvik-cache
4) Install ZIPs from recovery (ROM zip first, GAPPS and additions later)
5) Reboot and enjoy