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Oh deary dear..
Depends on the rcd rating and measured Zs values for the installation.Although, if using a modern double insulated (class 2 again) drill and wearing shoes in a dry environment, it is improbable that you will experience an electric shock
But you might flinch at the flash and topple backwards down the stairs and break your neck...
rive_gauche
If you have an RCD on the consumer unit then you do not need to worry about electrocuting yourself.