WARNING: This page is about a different car, the 2004 Infiniti M45 and 2003 Infiniti M45. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Assembling & Disassembly Cylinder Head & Associated Parts
Courtesy of NISSAN MOTOR CO., U.S.A.
CAUTION:
Attach tags to valve lifters so as not to mix them up.