eemoody: I cut the leather using a rotary cutter and quilters ruler. Went through really easy. You can also cut leather with ordinary scissors. Here is one I did with the front decorated. I used a leather punch (obviously with the letter "S") then used leather dye to paint the indented "S" then coated the square with a leather top coat then glued on the square of leather to the front cover using good ol' Diamond Glaze.
I also did another journal using an exercise book as the pages (rather than the handmade pages). I cut the exercise book to 7.5cm wide then in half to get two "signatures". I then used an ordinary drill and drilled holes in the "spine" of the exercise books. Here's what it looks like - and as you can see from this pic, that the leather is not thin and the rotary cutter had no problem cutting through it:
If you want more info, let me know!!