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Very devastated as my thuja hedge burned-out very badly. It was 25 years old hedge planted by myself from small cuttings. 
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What steps I should take to hope for it to come back? Would trimming burnt-out branches help? How hard should I trim it back. Thank you for your advice.
I have thujas which was severely damaged by a storm (more than the half of the top cut off, splitting in the trunk). I only removed broken parts.
After years they recovered to such a degree that most people will not notice they have ever been damaged.
I suggest to wait about a year to see how they recovers. Then you can better decide how to prune them for a full restoration.
If you can identify any completely dead parts now, then I would remove them immediately to bring more light to the remaining parts.
