The most challenging shift that needs to be made by an advisor is the transition from a seasoned practitioner to a supporter or helper. As a practitioner, you will be used to practicing your craft, and implementing policies and decisions. A judge, for instance, will interpret laws, police officers will enforce laws, and border guards will enforce immigration and custom laws, stop trafficking etc.
As an advisor, however, you will no longer be practicing your craft, or implementing policies and decisions as you did previously. Instead, you will be asked to use the experience you gained by practicing your craft to help others carry out their tasks more effectively. You will not be doing their task for them; you will only be building their capacity so that they can carry out their task more effectively.
In order to facilitate this transition from a doer to a supporter, you will need firstly to establish yourself as a resource, based on your skills, expertise and personal attributes. This will encourage your local counterpart to solicit your help, and turn to you for advice when needed.