Sand the area you want to fix lightly so the paper is flat and not sticking
out, PVA the area you want to repair, mix a little water in the PVA so it's
thinner then paint it on and right around the paper. This will seal it. The
PVA will dry quite quickly, maybe 1/2 hour. Repeat the PVA. Wait till dry.
Smooth over with Gyproc Easi-fill, wait till dry, between 1 hour and 1 day
depending on temperature. Sand smooth, then paint or line first then paint.
If you dont seal with PVA the paper may bubble. I use this method if there's
not too much damage and I have time. If there's loads of holes you may be
better getting it skimmed if time is important to you.