What can I prepare to help the organization through the transition?

No matter how brilliant the solution, if it changes the current state—as it almost certainly will— you'll need to assist with careful planning and management of the transition to the future state. To help keep resistance to a minimum, make sure there are no surprises. It's very important to set clear expectations of how the project will change the way people do their jobs.

Even if your project won't make major organizational changes, it will very likely bring smaller changes that you'll need to help the business manage. A business analyst's role with regard to change and transition management is most often to facilitate training. Because the business analyst is usually the liaison between the business and technical teams, it often falls to the analyst to identify—and occasionally deliver—the training the staff needs to successfully begin applying the new solution. As with any activity, having a plan is essential; thus developing a project training plan will serve you well.