Not over-wing, but had an interesting piece of SLF DIY instruction on an old TU-154 on a very domestic flight in China in the early 90'ies.
I was in seat B and A was removed and replaced with a huge crate with an instruction afixed.
EMERGENCY SLIDE
1. Remove emergency exit. (No problem apart from an engine located just outside)
2. Open crate
3. Take out slide
4. Remove string holding slide bundlet up
5. Throw slide out emergency exit
6. Open valve on air bottle to inflate slide
7. Try to fit your body through emergency exit
8. Pray slide is still there
Scenes of Chinese passengers getting points 5 and 6 mixed up kept flashing past my eyes and might explain why I kept choking on my Cognac. No, not from the inflight "service", from my private flask.
Per