['I have a co-worker putting the finishing touches on a big project and work, and I am really putting all my faith in him.', 'Nice! What is he working on?', "It's a proposal for some new things in our department. I really hope he doesn't blow it haha"]
I'm sure he won't. Sounds like he's a hard worker.
My co-worker is in charge of finishing up our big project. I am putting all my faith in them.