I haven't yet downloaded Solaris 10 (i86) yet, so I'll tell you about Solarisd 9.
For
test purposes, I think I've got that one installed on about a 400MHz box with probably 128MB of RAM and just for playing around, that works just fine.
As for installation, pop CD#1 in the drive, boot the computer from the CD, and follow the instructions. Take defaults in case of confusion.
Anything above that you need to either ask a specific question or check Sun's online documentation.
The secret of how to be miserable is to constantly expect things are going to happen the way that they are "supposed" to happen.
You can have faith, which carries the understanding that you may be disappointed. Then there's being a willfully-blind idiot, which virtually guarantees it.