The first thing to do is add the ice.
4 large cubes work well.
Then add the vodka.
A good way to measure is to fill it almost to the top of the ice cubes.
Add the OJ until it is almost to the top of the glass and then add a little mountain dew.
The more dew you add, the less vodka taste you have.
(The oj also does a nice job of killing the vodka taste) .