Forget a personal trainer, get your ass on muscletalk forums.
post up your diet, training and cardio vascular routine, you will get alot of good advice, i myself have got help from there and in the best shape ive ever been.
anyway, just remember that you can have the best, most quality advice, best routine, best diet regime but none of it will do anything unless you get off your ass and actually do it, then stick it through times when you feel like its not working, just stick to it.
rome wasnt built in a day, and neither will your body.
expect to see any difference after 6 months and thats being strict.