What exactly does fiberopoptic intubation anesthesia feel like?

Not too bad. If you are asking this question, i imagine you have been told by an anesthesiologist to expect an "awake, fiberoptic intubation" due to concerns with your airway. Even though you will be awake enough to keep breathing and avoid choking, most "awake" fiberoptic intubations are done with moderate sedation. You will also be numbed along the path of the breathing tube. Some coughing may be the worst.
Same. Some times direct placement of endotracheal tube is not possible due to patient's anatomy, like jaw , teeth etc, then a fiber optic scope is used to place the tube into trachea to administer anesthesia.
Nothing. Most fiberoptic intubations are done while the patient is asleep. If done awake then the area is made numb before we commence. Usually we give a sedation agent so that the patient is not aware of the procedure, and has no memory of it happening afterwards.
Safe and effective. Fiberoptic intubation is a useful technique in a number of situations. It is used when the patient's neck cannot be manipulated, as when the cervical spine is not stable. It can be used when it is not possible to visualize the vocal cords because a straight line view cannot be established from the mouth to the larynx. Fiberoptic intubation can be performed either awake or under general anesthesia.