Pet pearls bark

Can I install a closet rod bracket with only nails? (picture incl.)? - install closet rod bracket

Ok, I need a rod sagging already crashed twice, so I bought one of the following:
http://www.amazon.com/Stanley-Designs-82 ...

The thing is, I have a drill. I asked around and nobody has one. The only tools I have screwdrivers, hammers and nails hard.

Do you believe that your nails are sufficient to support its place too?

Please help: (
Thank you.