Just put your game iso into the same folder as Gitmo.
Open Gitmo and make sure under Source file mask: it says *.iso.
I recommend making a new folder for the Destination path: so all of the models and textures don't get extracted to the Gitmo folder.
Press Grab and it should start extracting everything into .gmo files.

Open Noesis and locate the folder with the .gmo files.
Double click a gmo file to view it.
Once it's on screen you can convert it to a format such as .dae (which will keep the rig) by going to File>Export.
In this window change the Main output type: to .dae - COLLADA.
Check Flip UV's and press OK.

Open Noesis and locate the folder with the .gmo files.
You can quickly convert all of the .gmo files to another format such as .dae (which will keep the rig) by going to Tools>Batch process.
In this window make sure Input extension: is gmo, Output extension: is dae and Additional parameters: is -flipuv.
Where it says Output path: you'll see the following.

$inpath$\$inname$_files\$inname$out.$outext$

This will add each .dae file to it's own folder.

If you want them to go to a new folder you can write

$inpath$\NewFolderName\$inname$_files\$inname$.$outext$

or if you want everything to be in a new folder but don't want the .dae files to separate into their own folders, then write

$inpath$\NewFolderName\$inname$.$outext$

Finally click Folder batch and OK. Hit OK again and it will start making .dae copies of everything.