Posted: 25/11/2013 at 21:26
You just have to practice it Dibs. How about doing forward rolls on a padded floor. You'd have to go straight over with your head between your shoulders doing that and that's what you need to practice to get it right!
As for the water going up your nose, that happens to everyone! Just exhale, through your nose, as you turn.
If you're doing tumble turns in lanes in the pool remember to keep your eyes open for the person swimming directly behind you, or forewarn them. You might inadvertently end up nutting them otherwise!