Short answer: it can be done. I have an old Reader's Digest book of needle arts that I picked up for a buck and it shows how, I have misplaced the book. I don't know how without instructions, and to me they were confusing but I wasn't trying to work them through which makes a difference.
I googled
knitting facings and there's a lot to sift through but you might find something useful.
Good luck and if you find some good info, please let us know!