To perhaps give you a simpler representation @hazqdee & @drutter, an RPC node is like a large database that contains the transcription of each block of the blockchain in a human-readable and usable format, unlike a witness node that primarily works with the raw data of the blockchain file. This implies the need for a sufficiently powerful machine not only to store the data but also to process it in a way that makes it usable, along with a stable and high-performing internet connection to respond to requests and synchronize with other peer-to-peer network nodes in milliseconds.

Setting up such a machine is not overly complicated, given the abundance of available documentation. However, what can be challenging, especially for non-server administrators, is understanding its functionality and being able to troubleshoot any issues it may encounter – whether due to increased data, traffic, or other factors.