All of the above is sage advice. The dedicated ST4, or MX5 is possibly the best way.
But let me also plug the StarMate system. It is what I use if I need to use a separate guidescope (normally I use the dual chip in the ST2K).
Mine is with a Celestron Nexstar 80, a ToUcam, and Losmandy rings DR105.
I use K3 for the software, and it goes well, but there is also PHD, which I haven't tried.
Get next to someone to show you, as at a distance it does indeed seem like black magic.
Gary
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