[EricH]

1) Lack of clamping, unless there's something I can't see.
2) Can't tell if the necklace is in fact tucked in. If it is not, that's a hazard.
3) Something goes wrong, and the press retracts, his head's going to get hit by the lowering handle.
4) Can't tell for sure, but it looks like he may be using a drill press and drill bit as a mill and mill bit. You *might* get away with the first one, if you use a mill instead of a drill bit. You don't want to do both, though.

He is in fact wearing safety glasses, which is a good thing. However, they can't protect you completely.