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It is pretty easy to replace a Kindle Keyboard screen, by comparison, say, to the K4 screen and those of the higher models. Removing the back cover is not hard if you do it correctly (you use a stiff plastic blade starting just above the right page back lever). Then there are 19 screws to remove, and one ribbon mounted connector, but no parts from the mobo need to be extracted. You can buy a replacement K3 screen on eBay for as little as $49 from US suppliers, and get detailed instructions in the process.
Kindle e-ink screens are extremely delicate and you can easily destroy them during installation, too.
Note that if you replace the screen of a K3 with 3G, you should save the old screen if your Kindle OS is less than 3.4. This is because the new screen may not contain the proper waveform, without which your graphics could end up washed out.
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