The difficulty level will vary based on how much paperwork you have already (for proving citizenship during your jus sanguinis claim). I had to submit FOIA req

The difficulty level will vary based on how much paperwork you have already (for proving citizenship during your jus sanguinis claim). I had to submit FOIA requests for records going back to the 1950's, as well as retaining a lawyer. The process took three trips to the German embassy, 18 months, and roughly $2000. However, once the initial process was completed for myself, processing it for my children took a single trip, no lawyer, and roughly $100 apiece for application fees.