I believe the marker lights are the yellow lights next to the headlights. How do you replace the marker light bulb?

 

It's no picnic like the other little 5-watters, but with some tenacity it can be done in about 10 minutes. Here is the thread I responded to, but sorry, I couldn't find photos or video. I recall I did find a picture somewhere, I will add it if I think of where. You may want to look through a few of these threads where guys are converting to LED. That may be where I found visuals.
https://www.clublexus.com/forums/mai...ight-bulb.html
You'll have to turn your steering wheel so you can access the panel. 3 screws I think and then you have to pull back the plastic housing. Then you will have to go by feel a lot.