Auto Indentation:
For a { } block I use the command: =iB (with the cursor inside the block to ident)
For re-identing a complete file, I use gg=G
Now for increase or decrease identation on a block, you have to select it (I use viB command) and then you do >> or << and if you want to repeat the identation just use the dot .
Also remember to set your identation settings with
:set shiftwidth=NUMOFSPACES
and
:set softtabstop=NUMOFSPACES
