Updated Dec 12, 2017
If it was just you and the giant bacteriophage, it couldn’t hurt you, but it would look really cool.
If you wanted to see it actually work, you would also need to find a bacterium the size of a fairly large house.
To show the relative sizes, here is an E. coli being attacked by some T4 phages:
Bacteriophage Ecology and Plants
That would be extremely cool.
If you manage to actually find one or both giant versions, please let me know, so I can come over and watch, too.
I’ll bring a notebook, and write some stuff, because that is the difference between just goofing around, versus doing legit science.