Will it be painful if i have to have 8 teeth pulled?

Not during: You will be completely numb for the extractions. Some patients also get nitrous oxide\oxygen analgesia (laughing gas or sweet air), while others prefer IV sedation. Some discomfort afterwards is normal. You will also receive some prescription pain medication if necessary. Discuss your options with the dentist or oral surgeon and express your concerns.

Maybe: Removal of the teeth will likely not be painful. It isn't a requirement, but you should consider having IV sedation to put you to sleep briefly. You might also consider oral valium and nitrous oxide. The amount of pain you have afterwards is very subjective. With that many teeth you will have some pain, lasting for several days to a week.

Depends: Teeth that are periodontally involved with supporting bone loss are easier extracted and cause less post op pain than teeth that are badly broken down and have solid bone support. Your surgeon will know from experience what post op pain you should experience and what meds will be needed for your particular situation.