Getting ready to start my first build - P180 case

[Salamander 2]

I'm getting ready to start my first build using the Antec P180 case. I remember reading several posts suggesting installing the psu first, and then following the included directions. I also remember one post from someone saying you should install the optical drives before the mobo, otherwise it's very hard to get the optical drives in. Has anyone else had this problem?

I will be installing a Ninja for cpu cooling. I don't know if that makes any difference in the installation order.

Any advice on the order of installation?