How do I convert GNT to GLM?

Could you please elaborate on the process of converting Golem Network Tokens (GNT) to Golem (GLM)? I'm aware that these are two distinct cryptocurrencies, but I'm unsure of the specific steps involved in making such a conversion. Do I need to utilize a specific exchange platform? Are there any fees associated with the transaction? Additionally, are there any risks or considerations I should be aware of before proceeding with the conversion? Your guidance would be greatly appreciated in navigating this process.