In step 4 press and hold volume down button till it boots to home screen with a safe mode logo on the bottom left corner. In my case it didn't vibrate at all.
Xperia E dual 2013 JB 4.1.1
To enable safe mode
1. Turn off the phone.
2. Press and hold down the power key until the phone vibrates.
3. Wait until the Xperia logotype disappears.
4. Press and hold the volume down key until the phone vibrates, and safe mode appears.
Note: To exit safe mode, restart the phone.