Process of proposing (new) specifications may not sufficiently clearly explained

From https://discuss.python.org/t/adding-a-default-extra-require-environment/4898/48?u=pradyunsg

I found this: https://www.pypa.io/en/latest/specifications/#proposing-new-specifications but honestly it’s quite confusing and not really helpful.

I try to understand:

• How to obtain a PEP number ?
• Where should I go to open the PEP ?
• Is the PR to " Python Packaging User Guide repository" the PEP itself ? Or it’s a completely different process and shall be done once we have reached consensus in the PEP ?
• Is there a template I can follow ?

I feel that these are all legitimate questions about the process that we don't clarify well enough, and we should possibly clarify each of these points in/near the "Proposing new specifications" section.

Start by reading the "Proposing new specifications" section linked in the issue and compare it with the four questions raised. Update the guidance so it explains how to obtain a PEP number, where to open a PEP, how the packaging.python.org PR relates to the PEP process, and whether a template exists. Done means a newcomer can follow the process without the cited confusion.