Whether the situation seems predictable or not we may wish to take a more or less organic approach.
Either, like the mechanic, consciously making specific changes through the force of our will, or, like the gardener, focusing more on preparing the ground and then letting ourselves change and develop without the imposition of detailed, moment-by-moment control.
There are many ways of going about the business of self-development or changing oneself. We can be gardeners for some areas, mechanics for others, we can focus on overcoming problems or building on strengths, we can aim to take control of ourselves or go with the flow.
Whatever routes we take, they are likely to be most fruitful if taken with understanding. And understanding comes from curiosity, from a questioning, engaged, and interested approach.
Some insights in the book "Manage Your Mind", by Gillian Butler, Nick Grey and Tony Hope, about personal development and seeing yourself in a different way. If you change the way you look at things, the things you look at change.