What Tools Do I Need To Install Them?

You could do it with some allan keys, a socket set and screw driver & some pliers would come in handy as well.

I would however recommend that get some engine degreaser and clean up the intake manifold, especially around the injectors where they sit in the lower intake manifold so that when the injectors are lifted out(when you lift the plenum off) no dirt falls in.

Please see here for comprehensive fitting instructions: