This does not work on unactivated Vitas.
I'm not aware of any tutorial videos, this is very easy to do anyway... Go to settings > network, set DNS to manual and primary to the above IP.
Yes. Once again make sure to take the precautions to avoid getting the PS3 (and your account by extension) banned. Also keep in mind not all PSP demos/games can be transferred to the Vita, make sure the one you're downloading can be transferred.
CFW is fine but you have to connect to PSN, which carries a ban risk. As long as you're on latest CFW, use PSNPatch and don't run homebrew while online you should be fine.
Best method to activate/download PSN content requires a PS3 (OFW works). Just download a PSP demo pkg to the PS3 using the same account as the one you have on the Vita, set the Vita's DNS to 212.47.229.76 and use CMA to install the demo to the Vita from the PS3.
Didn't know that, my bad. I know the cards from www.r4isdhc.com (exact url) are to be avoided for this reason, so is that the only manufacturer that does this?
Bit late but... any R4 that has a year in the name has a time bomb hardcoded in and stops working after 2 years or so, unless you turn the DS system clock back. To my knowledge, the best flashcarts are from r4ids.cn and r4i-sdhc.com in that order.
That's a backup. The actual emunand is on a hidden partition.
Did you make a sysnand backup? I'm asking because a sysnand backup, emunand backup and emunand partition wouldn't fit on a 4GB card.
There's a tool for Windows, but in my experience it refused to restore the NAND. That said you could dump it with that tool and restore it with Emunand9.