okay first id like to say a personal trainer is good, even top bodybuilders or sports atheltes use trainers (however MOST dont use them year round - only month by month).
However the most important thing is you will need to try and MOTIVATE YOUSELF. this will really help you!
*ask youself this: do i want to gain muscle or lose weight.. build a firm body etc..
SELF MOTIVATING TIPS
1) research Bodybuilding, Figure Athletes, Weight Loss, Protein Supplements, Bodybuilding / Figure Athletes Diets, Abdominal workouts etc.
-you can GOOGLE all of this and im sure you will find alot of information about it all over the internet.
-also you can search for this on YOUTUBE. with youtube: serach for body transformatons to start or just research what you feel you need to learn about - for example if you want to learn about bodybuilding diets: type in the youtube search: bodybuilding diets
anyways YES a personal trainer is good, however mostly for the basics(just to get you started) on how to use machines, stretching, proper form whilst lifting etc...
a personal trainer is also good for the advanced bodybuilder: most probably can assist in drying you out for competition, posing, just mainly the small touch up things (or some could say the big things?).
PICK A PERSONAL TRAINER OR NOT?
- there are however lots of bullshit personal trainers out there (MALE and FEMALES). so be careful not to waste ur money on a LOSER if you believe you need a personal trainer to assist you.
All the best with your goals.