[Stuck with my back against the wall, I need help!]

the lava part you can always use lava fabricators! they provide you with tons of lava!

They require a blaze rod and 2 magma cream to craft.

Obviously if people didn't have access to the nether they would look at other power generation options. It was just an example of what some people use the nether for.

[Stuck with my back against the wall, I need help!]

I couldn't play minecraft/tekkit without the nether. There are recipes which require ghast tears, blaze rods etc. Nether wort for potions. Lava for those who like magmatic engines.

[Can't craft Unlinked or Linked Books]

1) make a link panel in the ink mixer.

http://binarymage.com/wiki/doku.php?id=items:ink-mixer

2) Craft an unlinked book with the link panel and a piece of leather.

3) Hold it in your hand and right click to make it a linked book to your current location.