Success begins with God's law. The law of the LORD is perfect, reviving the soul. David says they are perfect, meaning they are without blemish, full of integrity and truth. David asserts that God's law has the positive impact of reviving or restoring the soul. The words reviving the soul are used in the context of a restoration from disorder and decay, from sorrow and affliction, from moral blindness to light, from sin to righteousness.
Clearly restoration is the first step to personal success.
The law, i.e. the first five books of the O.T. shows us how badly we fail to meet Almighty God's expectations of us. Failure to meet His expectations dooms us to a life of failure. There are some failures that are fatal. I used to fly at night over cloud covered mountains. An engine failure on my airplane would have been fatal.