Need help extracting textures.

Hello All,

I know it is possible to extract textures from N64 roms.
I have The_New_Tetris.z64 and I am trying to extract the textures from the menus in the game as well as the boards themselves (from each country)

Are there any information / tutorials out there that can assist me in doing this.
I need to know:
-what kind of tools/utilities to use to do this and how to use them.
-I need to know where / how / what to look for to find the textures.

if anyone at all can provide information you will be a great help

Thanks,
nju0843