Theres a thread about this floating in the Maxima side of town... Search the 5th gen forums... Its a PITA to hook on the bottom bolt, I witnessed my mechanic try it for 25 to 30 mins, raising the car and trying from bottom , then lowering car and trying from top.... Dont remember which way finally did it, but you'll see

( it was an '00 Max)
P.S... try calling the Nissan Dealership and seeing how much they charge for it compared to the Infiniti dealer
EDIT::: SORRY, DIDNT READ THE FULL THREAD, JUST NOTICED THAT ITS BEEN RESOLVED!!