Williams worked at Drayton Manor theme park to make ends meet after the Baggies axed him as a teenager.
The Wales defender, 27, said: "I did all sorts of jobs, anything that could make me money while I played part-time with Hednesford.
"But going out of the game and working my way up has served me well.
"When I left I didn't think I would be playing against West Brom in the Premier League.
"I don't have a point to prove to them, just to myself."