If you have the LEXUS CHECK LED (is that what they call it?) below the headlight, then you have HID's which is the D4S bulb.
IF you only have the amber turn signals below your headlights then its H11.
If you are handy with a wrench or screw driver, then its a 2-3 out of 5 difficulty to change. requires removing some parts but non essential parts to change. the bulb.
HID bulbs will range from 30-50 per bulb. H11 bulbs will range from 10-30 for a pair of bulbs