I was a skinny ass kid, skin and bone. I started lifting with a gallon milk jug filled with water on a broom stick because I was too weak to shoot a basketball up to the backboard. Plus I started to eat 24/7. I would set my alarm twice a night at 0200 and 0400 just to eat entire meals, beer, a gallon of milk candybars anything!
It worked well for me eating is the best, plus shakes are a life saver. You are right the heardest part for me was the eating.