Briefly: If in doubt, grab the nearest tool and try that. Or, as Randall Monroe suggests, "if you encounter a hex bolt, but you only brought screwdrivers, you can try sandwiching the head of the bolt between two parallel screwdriver shafts, squeezing the screwdrivers together with a hand at either end, then twisting. It doesn't work and it's a great way to hurt yourself, but you can try it!" Or buy a decent tool kit. Up to you, really. [XKCD]
How Not To Pick The Right Tool For The Job
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