Falling head-first through a hole onto the steel deck below, that’s what.
From then on, life was never the same again.
First, my head, right-shoulder, and back were damaged so they were the priority.
Second, I had to retrain and get back into work.
Fortunately, I'd recently bought a computer and I taught myself to use Microsoft Word. This was while studying for my City & Guilds 236 in Electrical Installation.
I'd like to say it was quick, but it was slow going (3-years all told).