You can’t, and that’s exactly my point.
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Not “very difficult” but ‘impossible’. See: Human Evolution debunked
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The fossil record lends no support for human evolution for several reasons: it is sketchy at best inviting proponents to make whatever desired of it via artistic license, is static hence one must presume evolution to see evolutionary links (the animation movie), and fossils are not positively linked to one another hence likely part of other animation movies altogether. Along the years, we have seen an inflation of hominid “species” as everyone that found a bone or two claimed they discovered a new species. And even after some cleanup, we’re still left with Neanderthals and Denisovans that successfully mated (fertile off-springs) with Sapiens despite being labeled “separate species”.