The only crochet experience i have is working around a knitted piece. I was confused too, but i just decided to treat my knitted piece just like an existing row of croched stuff. stuck my hook in every stitch and did the single crochet thing.
that's about all i know.
as for a knit border, i don't know. I've never added one of those to a blanket. actually, i've never made a blanket. my guess would be that it would leave ridge on the back side (from picking up the stitches) and that's why they have you do crochet.