Removing the headlamp is the easiest way. Two long threadbolts hold in the headlamp. You might have to jiggle it a little to get it out.
UPDATE:
Look in the manual. It explains that you have to partially remove the bumper in order to get the headlight assembly out. I know its a pain I've had to do it before. Don't yank too hard, it's plastic so it WILL break. Also, be careful that you don't bend the metal out of shape.
how do you replace headlight bulb in a 2001 celica gts
Are you asking how to replace the entire headlight assembly -OR- how to replace just the headlight bulb? Just the bulb.
beat the car with a bat
open the hood and pull out the bulb
Replace headlight bulb only when blown.
On older vehicles you replace the entire headlight. On the newer vehicles you just replace the bulb unless the headlight assembly is damaged.
To replace the headlight bulbs in a 2001 Acura CL, first, open the hood and locate the headlight assembly. For the bulb you need to replace, twist the bulb socket counterclockwise to remove it, then pull out the old bulb. Insert the new bulb into the socket without touching the glass, twist it clockwise to secure it, and reconnect the wiring. Finally, test the headlight to ensure it’s working properly before closing the hood.
Open Hood. Remove the cover from the headlight by prying up the keeper. Remove the metric 13 nuts holding the headlight in. Take out headlight and replace the bulb. Reinstall the headlight and reinstall headlight and cover.
http://www.bombaydigital.com/boxster/projects/headlamp/
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