Hey SentinelPrime , welcome to the 405th! Which game are you wanting the grunt to be from? We do have some armour of the Halo 2 Grunt in the Armory. My long term project involves making a grunt too (CE version) so I will be watching with interest!
These are probably the best mix of ease of use and detail to start out with. There's a few other folks out therelike PapaBraus who have free-handed Grunt costumes before so they might know of other tricks.
This is a comprehensive zip file including numerous files from multiple artists. Contents of zip-file: halo-2-covenant-unggoy-grunt-armor.pdo Modeler: Unknown Unfolder: Model needs unfolding