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I generally think that for the most part, as people, we are fairly predictable and deterministic, however the set of variables going into our behaviour essentially makes up the entire description of our body and its surroundings, making it a problem of incalculable dimensions as far as predicting behaviour.
Although subatomic particles may be non-deterministic, once the billions of them are combined into a single cell in a single flake of skin which comprises a microscopic piece of the covering of your baby toe, the amount of redundancy essentially reduces the problem from non-deterministic into mostly deterministic.
Although our lives may already be mostly determined, because of that subatomic non-determinism the future cannot actually be predicted even if we managed to capture the current starting variables perfectly, because eventually the low-probability event of a lot of subatomic particles all acting together will come to pass and the wings of a butterfly will cause an unexpected hurricane.
The problem of non-determinism in quantum mechanics goes beyond the redundancy turning it from non-deterministic into deterministic on average.
The results of the double-slit experiment pointed in the direction that quantum mechanics reacts to observers.
If you assume an electron is a wave and observe it like a wave, it will behave like a wave. If you assume it is a particle and observe it like a particle, it will behave like a particle. You can drastically change the result of the experiment, simply by choosing how you look at it.
