This is an excellent video by the Academy for Dog Trainers illustrating the state of the dog training profession and how to choose a professional trainer that will help rather than hurt your dog.
Here is an example of appropriate answers to the three questions:
What exactly will happen to my dog when she gets it right?
Your dog will receive rewards to positively reinforce the behavior.
What exactly will happen to her when she gets it wrong?
Nothing, or the reward or opportunity to earn the reward will be removed for that specific trial.
Are there any less invasive alternatives to what you propose?
No. Giving or taking away rewards does not hurt or scare dogs.
By Dan Raymer