I forgot to mention this, but I got the idea from this guy: Eric Testroete, who apparently got it from someone else but I saw his so I'm gonna stay with that :P
Someone pointed out that there was already an instructable for this so I'll link him on here as well: Real Life Big Head Mode
Step 1: Ingredients
3D program - modeling and able to export OBJ file
Pepakura - to change the OBJ file into cuttable paper images
100 lb cardstock - needs thick paper so that it'll hold the shape
Sharp scissors and Xacto Knife - for cutting paper... be careful
Super Glue/Hot Glue Gun/Double stick tape - to put all the pieces together
Resin or Casting Plastic - to harden the helmet
Step 2: Modeling
Ok so first things first. You will have to learn how to use the 3D program to model and texture your face. I'm sorry but you will have to learn this on your own since this step could be an instructable on it's own.
Here's a good video on how to model the face using Autodesk Maya:
After you finish the model, export it out to OBJ file so that Pepakura can use the file.