Hydraulic Press safety questions

I have a similar press. Taking your time to set everything in a good vertical line is key. Allowing time for penetrating oil or a little heat too. Another item is a good bushing driver set. Made my life so much easier. Using makeshift drivers, sockets, etc is a good way to have an accident.

Excellent advice. (straight and the correct style drivers)
I have never used one with guards, but I've never had anything fly out with any speed.
Usually just a POP and all your parts fall out on the ground.:-D