I am qualified as a personal trainer. A personal trainer at my gym costs $55.00.
In my honest opinion, it is a waste of money.
You would be better off with an experienced work out partner.
Most of the 'qualified' personal trainers that I have come across had in fact received their qualification by doing a 1 week crash course in personal training. Their expertise and knowledge is laughable and not worth your time or money.
If you really feel you MUST have a personal trainer, then choose wisely.
hardgainer (my two cents)