I would actually suggest making a mask out of fabric or stiff plastic (ie: a Hobby-Lobby mask), then painting it and attaching it to your face via spirit gum or some other skin-friendly adhesive. Have you also considered stencil-painting a mask using Mehron or Snazaroo face paint?
Liquid latex isn’t too difficult to figure out, but you would have to make a really decent mold first and that can be tricky. After making the mold, I would use a carefully-cleaned brush to lightly coat the mold layer-by-layer until it’s thick enough to peel away in one piece. Latex is actually fairly easy to cut with scissors, so you could use the above-mentioned Hobby Lobby face mask as a template and cut away all the tags and spare edges after the latex is dry. As for the holes in the face mask mold, when making my Pavi Largo mask, I blocked up the nose, eyes and mouth with cellophane stuck to the edges of each hole with crazy glue on the convex side of the mask. It’s not a perfect strategy, but it worked well enough to make this: