I'd have thought - you'd be lucky to get an engineer to allow you to effectively 'sit-in and watch', but good luck. You have to be mechanically minded to undertake an engine service. With experience and knowledge, the average competent DIY mechanic should be able to undertake gear-oil replacement, impeller change, check thermostat, oil-change and filter (only 4-stroke), change spark plugs, grease nipple points, grease and adjust throttle linkage, clean fuel filter, grease prop shaft splines, replace prop split-pin, check engine bolt torque settings, etc. These jobs don't require specialist tools.
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