As they said in the film, there was no place else they could go if the atmosphere could not support life so they might as well get it over with quick.
As for the piloting. Once the craft reached the atmosphere it was a glider. A very large but not too ungainly glider, so a highly skilled experienced pilot of conventional aircraft could play it by ear, flying by the seat of his pants as it were. The Space Shuttles were gliders on their landing runs. The main pilot also helped design and build the space ship, so he knew what he was doing.
This ship was built like a tank, literally, so it handled landing stresses that would crumple a conventional aircraft like a candy wrapper.
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Thanks for that. I needed to suspend disbelief a bit more
It's probably 20 years since I saw the movie, and it wasn't bad, but I didn't like it as much as some other sci-fi movies of the 50s like 'The Day the Earth Stood Still' and 'Forbidden Planet'. The comic reinforced that belief, though the art was good. If I'd seen the comic in a store back then, I would have bought it.