Going to the dentist for wisdom teeth extraction and cavities removal. Help what to expect?

It Depends. What to expect may depend upon the number and extent of decay in the teeth to be restored, the position and development of the wisdom teeth, type of anesthetic/sedation options available, the experience and skill level of your dentist, and more importantly your level of anxiety. A consultation with your dentist would be strongly suggested.
Relatively Painless. Fortunately, modern anesthetics allow oral surgery, especially wisdom teeth removal and restorative dentistry to be done virtually pain-free and worry free. With the profound local anesthesia and IV sedation you will have no recall of the events of the oral surgery or experience any pain.
Talk to the dentist. Based on the location of the wisdom teeth and complexity of removal, you should have a consult on what to expect.