I see.
I undestand it is hard. Unfortunately, from my limited comic-drawing experience, I have to agree it is a lot of work. So basically I am doing it becasue I enjoy it, partly probably becasue it is my own story I want to tell, so I am invested in it and for once, no-one tells me what to do 
If your project is unpaid, but the story generally laid-out, it will probably not be easy to find someone, especially if the story is long.
I, for one, would also have a hard time drawing for free for a person I do not know and whose story I do not know, either, and can't tell how much I am invested.
But I suppose at least some writers are successful in their search. If you can't find anyone right away, maybe be more active in the community, so that potential artists can get to know you a bit.
I am just rambling my thoughts now, though 
Good luck!