An ERP project is a complex undertaking as your implementation partners have to have the right set of experience and skill to be parachuted into a business that has been built with the hard work of the founders and employees over a number of years and "migrate" them onto an encompassing ERP to improve their operations usually in the space of a few months to 1 year depending on size and complexity, in some cases 3 years for global sized companies.
The differing levels of skill sets you would expect to interact with during the course of a program from your implementers would be
Finance Managers and Accountants
System Architects and Designers
What are the qualities expected of a company embarking on the ERP journey to ensure that the project goes smoothly.
Mature business process
Documented policies for each department
Active governance structure from inception to delivery
Dedicated Internal Project Manager that knows the business inside out
Willingness to learn and adapt as the project evolves