Thanks Chuck...........
Ok InvisibleLL .......... similar name to someone else :o)
Right. The agent's right in my experience. It's a balance between presenting a "tidy" property, so they have nothing to complain about, but not doing too much. A new buyer would only rip it all out again.
For selling ............. new plasterboard, not at all expensive, stick it with the right adhesive. It's called "dot and dab".
For a perfect job, have it skimmed (plaster).
For you .......... just joint it. The professional way is with a trowel and sponge finish. For a DIY job ............. just polyfilla the joints, sand down and paint to finish.
Take your time .......... you can do it :o)))