How do I run a bitcoin node on a virtual private network?

Excuse me, could you possibly clarify for me the process of operating a Bitcoin node within a virtual private network? I'm seeking a detailed, step-by-step explanation on how to go about setting it up and ensuring its secure operation. Could you possibly walk me through the necessary software, hardware requirements, as well as any potential challenges or considerations I should be aware of? I'm a bit of a novice in this area, so any additional insights or tips would be greatly appreciated.