Changed my oil.
Yawn! I hear. Let me explain...
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I use a self-priming pump. Don't have to get under bike and undo sump plug--you know, when the oil then runs up your arm? Doesn't happen to me anymore.
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Also syphon out primary cavity. Use a thinner tube for this, from a wet'n'dry vac.
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Then, because I'm not very strong, and I usually miss a funnel and oil goes everywhere, I pump oil back in from the large can I have.
Usually I pump oil back into primary cavity, but forgot this time. I'll ride bike, then top up main oil reservoir.
No messy tray. No mess at all really. Done it in house before.