This is probably the least emphasize point when one is ready to embark on the Iron journey:
Not everyone is physically and psychologically the same.
Each individual will response to a training regimen, a nutritional regimen, supplementation differently, and each individual has to adjust his/her program specifically to find that right frequency to lose, to gain, to grow, to be stronger and healthier.
Think about it, if company XY or diet plan zk is so successful in giving huge number of customers great gains or lost in weight, wouldn't you think most of us will be using it and be healthy by now or be like the next Arnold?
So if one program is not giving you result, don't sweat it, just find another program to suit your need.
Be flexible, be knoweledgable and be patience.