Kinda agree with the above posts.
The hardest part of lifting is the mental part. Lifting gets a bad reputation because everyone thinks people who lift heavy are lacking in cranial development.
Anyone who lifts competitively will say its COMPLETELY a mind game. Forcing your mind to tell your body to lift an extra 2.5 or 5 lbs on your max can be the toughest yet most satisfying thing to do in the world.