Help about using a Kindle DXG as PC display

Sorry if my questions are too obvious. I have used the search tool, but I don´t have find an answer.

I have brought an used Kindle DXG (I will receive it within 2 or 3 days). The software version is 2.5.8, serial number B009... I know nothing about linux, only Windows (forgive me...)

I want to use the DXG as PC monitor (or MS Word will kill my eyes), using the metod described here:
http://www.pcworld.com/article/25958...c_display.html
(I hope there is no problem about posting this link)

But I have lots of questions:

1. Can I jailbreak a Kindle DXG (B009...) running software version 2.5.8 using the archive "Update_jailbreak_0.13.N_dxg_install.bin" from this forum? Or I have to update the firmware before?

2. Will I brick the Kindle DXG if it has been jailbreaked previously and I try to jailbreak it again?

3. Can I use "Update_usbnetwork_0.57.N_dxg_install.bin" from this forum instead "Kindle -usbnetwork-0.37.N.bin" mentioned in the article?

4. Any advice before I try to make this "project"?

Thank you!