Effortless. I started my aviation career as a Helicopter Engineer in the Military. Both Military and Civilian maintenance requirements are comprehensive and follow strict regimes for servicing, component replacement and quality control. Both have in built proactive and reactive components that are driven at heart by reliability programmes.
For offshore helicopters there are additional maintenance practices to support the operational and environmental operating conditions.
As an offshore pilot I spend plenty of time in the hangar watching how our engineers work and behave and in my opinion they are the best in the business. There skill and dedication is second to none. However, just like pilots, engineers and offshore workers we are all human and errors can occur.
I hope this answers your question.