You can install Solaris different ways. The simpliest one is to put DVD to drive, sit down near graphical console, keyboard, mouse and click for installation options. But this way you can install Desktop station or small server install.
If you have more hardware and especially you want to build High Availability installation, where essential thing is homogenous of systems then worth of attention are other methods of installation as Flash Archive or Custom Jumpstart.
You must to find your own preffered type, I prefer now Custom Jumpstart.