How to install CyanogenMod 12.1 SNAPSHOT with Locked boot Loader Xperia SP C5302 ??

I am new to the installing the custom roms and all that i read about some stuffs but the unlocked boot loader is something that i can't risk .
Moreover i want to know that the CyanogenMod 12.1 snapshot with LBL ..... How should i do this please help and guide me step by step as i already soft bricked my phone once .......

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