Carefully. I did the same thing with mine. See this post:
http://www.thenissanpath.com/viewtopic. ... ght=#11912
I ended up removing the dome light assembly from the end facing the front of the vehicle. That's where the clips are. The rear of the assembly doesn't have the clips. So, gently pull on the front of the assembly until it pops out. I had to use a tool I have that removes trim panels & it took me some time because of how much force I was using & being scared of trashing the entire assembly. However, if you read the last post in the link above, it seems you can simply pry off the lenses rather than dealing with the entire assembly. Should be pretty simple, just remember everything is fragile plastic.