It is assumed that by now you know how to remotely manage your system.
Most of the other steps on this site must be completed before trying this!

Preparation:
go to rpmfind or rpm.pbone and collect the modules first, or download an ISO of redhat 7.3(recommended)

Installed via package manager in WebMin:
(stick to the install order because of module interdependency)

Modules for XFree86:
Glide3-20010520-13.i386.rpm - Glide runtime
XFree86-font-utils-4.2.0-8.i386.rpm - Font utilities required
XFree86-base-fonts-4.2.0-8.i386.rpm - Base fonts
Xaw3d-1.5-12.i386.rpm - MIT Athena widget set 
XFree86-4.2.0-8.i386.rpm - Core program
XFree86-100dpi-fonts-4.2.0-8.i386.rpm - Fonts
XFree86-75dpi-fonts-4.2.0-8.i386.rpm - Fonts

POSSIBLY optional:
XFree86-tools-4.2.0-8.i386.rpm - Various tools for XFree86
XFree86-xdm-4.2.0-8.i386.rpm - X Display Manager
switchdesk-3.9.8-2.i386.rpm - X Desktop Switcher
xinitrc-3.22-1.noarch.rpm - X default startup script
XFree86-twm-4.2.0-8.i386.rpm - A simple window manager

Modules for Xconfigurator:
gtk+-1.2.10-15.i386.rpm - The Gimp Toolkit
gdk-pixbuf-0.14.0-8.i386.rpm - Image loading library
Xconfigurator-4.10.7-1.i386.rpm - Configuration tool for X

Module for VNC: 
vnc-3.3.7-1.i386.rpm - (www.realvnc.com)

You now have vncserver ready to run.
Open a telnet session, su - to root, and run vncserver :1
supply a password and you are ready to go.
Just start a vncviewer on your desktop and enter the name or IP of the server (ie: 192.168.1.1:1) followed by a :1
You can use WebMin to create a start/stop button in other commands, just remember to set root user and environment.
(if your a true worrywart, please set up a user account - don't use root all the time like I do!)

If you want to set up internet access, remember to do two things:
1. add SSH to vnc - if you can't figure out how... don't do the next step!!
2. open vnc's port in your firewall - 5900 is the default I think, check the vnc documentation.

Now all you need is a GUI like GNOME or KDE and you'll really be cooking!
(there is a trial-and-error module install order list on this site for GNOME)

Remember: Questions can be posted in the FORUM section !