From the R22 Pilot's Operating Handbook:
OVERCONFIDENCE PREVAILS IN ACCIDENTS
A personal trait most often found in pilots having serious accidents is overconfidence. High-time fixed-wing pilots transitioning into helicopters and private owners are particularly susceptible. Airplane pilots feel confident and relaxed in the air, but have not yet developed the control feel, coordination, and sensitivity demanded by a helicopter.....When flown properly and conservatively, helicopters are potentially the safest aircraft built. But helicopters are also probably the least forgiving. The pilot should allow himself a greater safety margin than he thinks will be necessary, just in case.
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To fly is human, to hover, divine.