What to do in the first 24 hours, who to tell, and what to write down.
The first day after an injury shapes everything that follows. Tell a supervisor straight away and ask for it to be written down; a verbal report that nobody records is the single most common reason a claim runs into trouble months later. Ask for a copy of whatever is filed, and keep it somewhere you will still be able to find it.
Write your own account the same day, while it is fresh: what you were doing, what happened, who saw it, and what hurt afterwards. Note the names of anyone nearby. If you see a doctor, say clearly that the injury happened at work, and keep every appointment letter. None of this is complicated, but almost all of it is easier now than in six months.