There are two options.
Single user install, in your own /home/me
Root install dunno how this works!
I used the RH7.0 install CD, which was equally unsupported. If you go to www.sun.com
the install advice is confusing to say the least.
I suggest you log in with your regular account and click on the install binary. It should run and install under /home/you
Hope me/you is comprehensible.