I do hope this mass of postings doesn't put people off having teeth removed when necessary. Some decades ago dentists liked removing wisdom teeth 'in case' but nowadays IMHO they now only advise extraction when necessary
Some are easier to remove than others: a tooth that has partially erupted and which is impacted in the bone will be more difficult. A good dentist will take an X ray and only remove those within his or her capability. Pain is usually not too bad. The difficult ones are referred to max fax surgeons who may need to remove some bone. Historically this was ouch
but nowadays most patients are back at non flying jobs within 2-3 days