Proofreading
An eye for detail is essential, but alone not enough: the knock-on effect of proof corrections can be expensive, so they had better be necessary, not just nice to have. I respect this requirement and, as a typesetter myself, can suggest ways to minimise the disruption in repairing an error.
Sometimes, particularly with shorter material, what’s needed is a single-pass examination of both the content and its presentation; I’m happy to perform a ‘proof-edit’ if this is what you need.
Technical: I normally annotate PDFs using Adobe Acrobat, but can accommodate other markup requirements.