Spacing btw Header & Title

In your dashboard area go to Appearance->Theme Options, and choose the “Custom Style” tab. You will need to add CSS in the Custom CSS editor here.

I can’t for the life of me figure out how to reduce the spacing between the slider and navigation…

You’ll need the following CSS:

#header_container{
padding-bottom: 0;
}

You can change the value of padding-bottom as you wish, depending on how much space you want between the slider and the navigation.

…and the title and body of my pages

Try the following:

h1 {
margin-bottom: 0;
}

#subhead_container {
padding-bottom: 0;
}

#content_container {
padding-top: 0;
}