How to convert VeChain to VeThor?

Excuse me, I'm trying to understand the process of converting VeChain to VeThor. Could you please explain the steps involved in detail? I'm particularly interested in knowing if there are any specific requirements or precautions I should be aware of before proceeding with the conversion. Additionally, are there any fees associated with the conversion, and if so, how much can I expect to pay? Your insights would be greatly appreciated.