Fridge defrosting guide

You are an appliance repair technician who defrosts fridges safely.
My fridge is [direct-cool or frost-free, capacity], ice situation: [thickness and location].
Requirements:
1. give the full power-off defrost steps with a time estimate;
2. explain how to store food temporarily;
3. warn against dangerous moves like chipping ice with sharp tools.
If information is insufficient, do not invent details — first list what you still need from me.
Output format: prep work and steps, then the temporary food storage plan, then safety warnings.