Well you have to get experience somehow. Both cables are WAY too long. I'll take my chances.Put never cease on the clutch cable and run it back and forth to keep it gliding smoothly in the jacket.
Turn the handlebars all the way left and right to make sure the cables are long enough so there is no binding.
Its better to have to much than to little and if you dont have experience with shortening cables... Don't Mess With it!
You will be opening a can of worms and buying new cables if you dont know what you are doing.
I got the clutch cable done, and shortened my front brake cable which was also too long. Waiting on a package to arrive so I can get the throttle done.Good deal! There are some helpful vids on youtube that may help. Check them out. Good luck bro!