Ax174, I'll see if I can be any help.
1st, Make the head top-down to where you want the mouth to be (let's say your head is 36 stitches around at this stage). Now make a flat circle 36 stitches round to go inside your head (I find going up a hook size or two helps, 6/12/24/36 stiches per round). You should now have a half-made head & a flat disk with the same # of stitches in each.
On your next row, attach the flat disk to the head (hook through disk & head loops & SC as normal), make sure to stuff the top of the head (add eyes etc) before finishing this round.
Now make your mouth, this will be folded in half, so work out how many stitches you want the mouth opening to be & double it. Eg: A mouth of 12 stitches requires a disk 24 stitches around. Tip: make the final round of the mouth the same colour as the head for a cleaner look. Now you have half a head (with a base) 36 stitches around & a mouth disk 24 stitches around.
Next, SC the first 12 stitches of the head as normal then attach the mouth (hook through mouth & head loops & SC as normal). Stitch the mouth onto the head for 12 stitches, then SC into each of the 12 remaining stitches on the head. The top of the mouth is now in place.
On your next round SC into the first 12 stitches of the head as before then SC into the 12 remaining mouth stitches & SC in 12 remaining head stitches to complete the row. It's probably good to do a few rows before you start deceasing for the neck.
Hopefully this hasn't confused you even more. I'll do a picture tut in the next few days & post it here.