you know how, but you need to know how?
In a standard
Ellipsoidal, you'll unscrew the
base from the
instrument using the thumbscrew. You'll pull out the
base with the
bulb attatched, making sure it doesnt scrape too much on the
reflector, which it is inserted in. Once out, you can grasp the
bulb by it's own
base and pull it out. Some times it's hard, so you can use pliers if it's feasible to do so, but I find pulling it myself the easiest. Of course, if this is a burned out
bulb, you can pull it by the glass, just making sure it doesn't
break in your
hand, of course.
As a
safety precaution, you need to know the device is off or unplugged.
When you put a
bulb into the
fixture, it's just the reverse process. Just make sure you don't touch the
bulb and make sure it's seated PROPERLY in the cap.