Interesting how others have commented how easy a seat belt is to use.
I was in Cathays new 'toastrack' business class a few weeks back. The upper deck was full. At the end of the safety demo the FAs went round and put the sash belt on each passenger. I was the only person in that cabin to have put the belt on correctly.
Now admittedly this was a three point belt not your usual lap belt. Even so the cabin was radically different to the normal cabin layout yet that did not seem to trigger any curiosity in the other passengers. I spent the boarding wait exploring the seat (took me 10 min to locate the life jacket). Most customers spent the safety demo reading the newspaper.
The flight attendants just smiled when I mentioned that nobody could put their belt on correctly. In their position I would have had had a fit.