[kingkop182]

I'm not sure exactly what your set up is at the pool, but I would advise separating the swimming of lengths from tumbling to begin with.

If you can set your self at the shallow end away from the people doing laps I'd practice swimming in tumbling, pushing off to a distance of about 8-10 metres, stopping and doing it again. When I swam competitively we used to spend half an hour a session doing this.

As mentioned don't worry about turning mid tumble..... this will come in time. Just concentrate on swimming into the wall, making the last stroke exaggerated, strong exhalation through the nose (many people worry about water going up there nose and this is a major stumbling block). Flip (take your time) push off whilst on your back.

Really the only thing that will help is practice... It is very much a 'feel' thing and cannot really be taught. Just go for it over and over again, hence why you should only be swimming in from about 10 metres.