There are several ways to do indenting using Vim, my current favourite is to do the following;

  1. Place your cursor where you want to begin to indent.
  2. Press V to select that line
  3. Move down the lines you want to indent using j
  4. Press > to indent, or < to outdent the selected text

Of course if you just want to indent or outdent one line you can type > or < when you are on that line.