The orbital maintenance is subtle, but feasible. There are many papers on it, including http://wiki.solarsails.info/im... . One has to "tack" the solar wind, using the consistent thrust from the sun, and manipulate the angle of the solar sail to the solar wind. With a relatively heavy satellite to which the sail is tethered, you can theoretically shorten the leads that connect one side of the sail to help create that slight angle. I'd also suggest keeping a slight electrical charge on the sail, to help it stay fully deployed even if it happens to orbit behind the Earth's shadow. But that kind of orbital maneuvering is vital to both earth-orbiting solar sails, and to asteroid mining solar sails, and it's reasonably well understood.
Note that this is all very gentle orbital control. No depletable thrusters would be needed in active service except, very possibly, for urgent emergencies such as time-sensitive decommissioning. The maneuvering is extremely low acceleration, and the entire structure except for the power transmitting central body is very light, very flimsy, and very cheap.