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How is it that this planet is neatly placed the exact distance from the sun to maintain life without being too hot or cold for life?
There are 7 other planets which are
not the right distance from the Sun in our Solar System. In the Milky Way and other galaxies in the universe, there are millions if not billions of planets which are also the wrong distance from the star which they are orbiting. When you have so many of these planets, chances are that at least one of them will have the conditions required to support life. Since the Earth has the right conditions to support life, life was able to thrive on this planet.
We are carbon based life forms. There may be other life forms, e.g. silicon based, which are able to withstand temperatures and conditions which we would consider extreme. And those silicon based life forms, if they exist, will probably think that the temperature on Earth is either too hot or too cold for them.
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How else is evolution possible?
Natural selection
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There are 3 types of people: Those who CAN count and those who CAN'T count.