You don’t need to hire a professional, you can patch the holes yourself. First make sure the hole or crack is not part of a larger structural problem or caused by a leak.
You’ll need some simple tools and some speckling compound.
First scrape away any loose paint or plaster from the holes. Use a knife if necessary.
Lightly sand around the hole.
Scoop the speckling compound onto your putty knife and run the knife over your crack or hole. Let the compound harden and apply another layer. Continue applying compound until the crack or hole is completely filled.
When the final layer is dry, gently sand and cover with primer.
Once the hole or crack is covered with primer you are ready to paint your room. Wasn’t that easy!