Oh yeah, on that topic, everyone should have at least a H, 2B, 4B and 6B pencil for pencil drawing. The difference a range of tools makes over a common HB pencil is astounding.
Faces are really tricky in general, so especially in the early days, cheat. Draw lots and lots of construction lines. Sketch out your proportions clearly before you draw the picture. Draw bald people to get an idea for just how big the skull is. You're not going to be making great-looking pictures on your first try, so feel completely free to do basic parts in isolation - just practising eyes, or noses, or mouths - if it helps you get a better idea of how to do it.