2. take off the mirror cover, you can replace the bulb.
3. take off the bulb in the light assembly and replace the bulb with the one in pic 2.
4. BMW does not offer OE kit to replace interior reading lights/footwell lights, you have to buy them somewhere else (eBay or ...?).

Simple job.

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--2004 E53 X5 4.8is - ECE version; right hand drive; Located in Hong Kong; ext. black sapphire metallic; int. leather black; adaptive dynamic bi-xenon headlights; 16:9 onboard monitor w/o navigation; 20" genuine BMW Y-spoke 214 wheels with Bridgestone Dueler H/P Sport tires; Int. rear view mirror w/ compass.