How to call for an alternative header file

I have no programming knowledge at all but am trying to create a page on my blog that has no sidebars and a header with no navigation bar.

I have the default header.php file on my blog.

I made a second header-2.php file that has no navigation bar.

I have a page-nosidebar.php file which I created to have a blog page with no sidebars and a header.

Instead of the default header I want to call the second header
header-2.php to use only on the no sidebar page.

But I don’t know how to do it (modify the code)

Here is the link to the code for the page-nosidebar.php file:

http://pastebin.com/Z69fZGwd

I’m guessing I have to modify Line 7
<?php get_header(); ?>
but I don’t know exactly what to change.

Any help would be greatly appreciated!

Thanks.

Robert