Not too hard. So far I have done it with three B&W portables in a row using different drivers under Windows 98 and DOS without too much trouble and managed to get one color LCD panel with composite input working with a bit of flicker. I have also bought two commercial scan converters before I learned how to build the small circuits myself. Building the circuit on breadboard is great experience and I highly recommend it.
Consider that for the price of a single LCD panel, you can buy ten portable B&W televisions which will last you at least 40 years underground at about 20% of the power requirements.