Eat a lot and train hard, I am sure that you will succeed.
If you don't like don't do it. But don't forget that: NO PAIN NO GAIN.
Yes it is better to keep training even if your muscle is still sore.
Perfect form is the most important thing to have a perfect body, it's impossible to make a painting with a big brush
My training was based on concentration, and it's impossible to cheat when you are concentrated
To be tired it is only in your mind.