Internet install behind proxy.

I seem to be having a slight problem with the install process.
The initial boot CD comes up fine and then by setting the repository server and paths correctly and adding the proxy and authentication details in the appropriate places, the installation system comes up.
However, once into Yast2 it throws a curl error being unable to find the repo.
Hitting Try Again prompts for the repo details, but there’s nowhere to enter the proxy info.
Reading elsewhere here, there’s all sorts of stuff on editing configs to get Yast to work through a proxy, but that’s not a great deal of help with an unformatted disk…:wink:
Any ideas, or am I just looking at a tedious download of a full DVD image here?