Just follow instructions..
First download the kernel and ROM (and Flashtool http://www.xperiadownload.cz/index.p...ashtool-6-2014
Place ROM on to SD Card
Place Kernel in flashtool Firmware folder (C:\Flashtool\firmwares)
Install either on of the Recoveries depending on your software version
Place the ROM (zip) into your SD card
Wipe whatever it says to
Flash the Rom
Goto advanced and 'Fix permissions'
If your on ICS DONT REBOOT
Take out your battery and open flashtool and select the lightning icon select the first option and when the menu comes up find the kernel and click flash
Once the files are ready (when the window comes up to tell you to connect in flashmode) connect your device in flash mode (Make sure device is off hold down volume down button and connect USB [Green LED should come up])
Then once thats done just unplug and reboot