It is very simple to install VS 6.0 on Windows 8. When you run VS 6.0 setup file windows will show you compatibility warning. You can open properties for setup file and in compatibility tab choose windows xp and run as administrator. Close the properties window. Now run setup file.
If it will show compatibility warning again, just ignore it by selecting run anyway option. It will start installation. Follow normal installation steps. When finish it may be hang. So open task manager and close the application running installation for VS 6.0. VS will be installed. You can find the VS applications in the installation folder you selected in installation process.