Hello,
if you clicked on this guide you probably don't know what World Viewmodels are.
When you turn on World Viewmodels the game switches and instead of the normal viewmodels
shows what everyone else sees when they look at you ingame.

( Warning: Some cosmetics might cover the camera and make this mode not work )

Anyways now that you know the basics lets dive right into it...

First you will need to start the console,
if you don't know how to do that, search it on google.

Do you have the console enabled yet?
Yes?
Good.

Next open the console and put This command:
cl_first_person_uses_world_model 1

And you are Done!

In order to reset back to default Viewmodels just put
cl_first_person_uses_world_model 0
into the console.

( You just need to put the same command into the console you just replace the 1 with 0 )

Here are some examples
Spy:





Sniper:




Medic:




Engineer:






Demoman:





Pyro:




Soldier:


Scout:



Heavy:



Sandwich: