Use standard Joomla! instructions:
http://docs.joomla.org/Installing_an_extension 

Use standard Joomla! instructions:
http://docs.joomla.org/Uninstalling_an_extension
If you have issues, also you can only disable it without uninstalling. If you can't access Joomla Control Panel, you can go directly to the database through PHPMyAdmin and set "published" field to "0" in "jos_modules" table.

For friendly URL's you can create a menu type (like mainmenu or topmenu) and then add a menu item inside this menu type. This menu item should link to your LPD item. So you use the menu item alias as your friendly URL.

Yes, you can. Please use standard Joomla! instructions:
http://docs.joomla.org/How_do_you_put_a_module_inside_an_article%3F

The only solution we have for the moment is to edit the index.php file of the template this way:
if( preg_match('/com_lpd/', $_SERVER['QUERY_STRING'])==0 ){
{your template css files here}
}
So your templates css files are loaded only if "com_lpd" is in the url.

Yes you can. You only have to create a LPD menu item and set it as the default menu (see image below).

Yes you can. You could use Jumi extension to embed any code in your LPD item (Slideshare, Google Docs, YouTube, etc).

To disable feedback popup, please go to this file:
{path_to_your_site}/administrator/components/com_lpd/admin.lpd.php
and comment lines 88 to 96.