Inscrutions:

I would think by replacing the current domination model files that you might have to verify the cache if you choose to 
delete the new models. So if you don't wanna be lazy, you can back them up or w/e. 




Follow the path of the 2 folders, if you don't have that folder already, make it. 



/tf/materials/models/player/items/pyro (for the VTF's)

/tf/models/player/items/pyro (for the models)



It should ask if you want to replace the files, you should do so (for all 5 of the models). 