You should know that a properly trained dog will respond properly to all its owner's commands, and will not display resistance, displeasure or confusion. It's really not difficult to train a dog at all, once you know what to do. I believe any dog can be trained if they have the proper trainer. I have a blog that has good information on this exact subject. If you feel like checking it out, I would completely suggest it.
http://effective-dog-training.blogspot.com
If you're the type of person that looks at dog training as something difficult, DON'T. There are just a couple of things you haven't learned how to do yet...
Jamie spoke these words of wisdom in

I have a problem, perhaps you can help.
I'm training my dog in open work.
Yesterday things went well, except, he decided to pull a comedy act. Everytime I asked for a "front" then "finish" he'd get down and ROLL over and around then sit up at heel.
He was so hilarious. I couldn't help but laugh, rewarding him for his style and sillyness, even though he must not do that in the ring.
Jamie spoke these words of wisdom in I have a problem, perhaps you can help. I'm training my ... help but laugh, rewarding him for his style and sillyness, even though he must not do that in the ring.

LOL Shy decided to turn the sit-down-sit into a sit-down-rollover. Twice. Emotion: smile Everyone was cracking up at her, and I confess I was having trouble too, given that clowndog used to stress out when showing. Then there was the utility style moving stand in APDT rally. She decided to add a bonus "drop and rollover on call-to- heel". This was when their Level 3 had just come out and the judge was scratching her head how to score the additional skills Shy threw in. Again the crowd totally cracked up. Silly dog! (And why did I teach her freestyle?)
Hope
CanineDivine (Email Removed) spoke these words of wisdom in
Jamie spoke these words of wisdom in I ... even though he must not do that in the ring.

LOL Shy decided to turn the sit-down-sit into a sit-down-rollover. Twice. Emotion: smile Everyone was cracking up at her, and I ... skills Shy threw in. Again the crowd totally cracked up. Silly dog! (And why did I teach her freestyle?) Hope

I understand this may actually be legal in CDX.
The regulations say the finish is to be executed as in the novice recall exercise. That section says, "The dog must go smartly to heel position and sit. The manner in which the dog finishes will be optional, provided it is prompt and that the dog sit straight at heel."