Three durable steps. Most personal development plans fail because they skip one of them.

1. Define one constraint that's non-negotiable

Writers who write every morning, runners who run every day. One non-negotiable constraint builds discipline that generalises.

2. Build a weekly review habit

15 minutes, same time each week. What worked, what didn't, what's different. This is where the plan actually improves.

3. Stack new habits onto existing anchors

"Right after morning coffee" survives; "at 6 AM" often doesn't. Chain new behaviours to automatic ones.

Three steps. Simple on paper, difficult in practice — which is why so few personal development plans survive.