The simulation can help you achieve the optimum design from a functional perspective. It is at this point, when the design is most fluid, that changes can be made both quickly and cheaply. As the design begins to be settled, then the model can be updated to reflect the changes to the product, giving you full performance information as the design progresses. This allows rapid assessment of key changes to the model, ensure that an optimum design is achieved. This might be undesirable deformation under loading, breakages or unacceptable vibration.
Analysis can provide valuable insights in qualifying and quantifying the problem.
With this information it is usually possible to suggest one or more modifications to the design, and to test these ideas in the analysis model. Attending a training course will only show the new user how to drive the software, and the general concepts behind analysis. Solving real-world problems is another thing entirely, and relies on much experience in the use of the method. Consultancy is a fast and profitable way of transferring this knowledge so that you can leverage the maximum use from your FEA software investment. It is unlikely that a new analyst will be able to quickly build and develop a good FE model for a complex project.