Communications is a liquid environment. You must roll with changing demands and influxes. Clients may be fickle, subcontractees demanding and external markets volatile.
Are you ready for it? Roll with the punches never meant so much. If you never trained in boxing, it means: Take the sucker punches, fake a good roll and get up to fight again.
Keep moving forward. It is all part of the ambience that is global communications. Treat your preferred clients and all clients with the utmost respect.