DD is doing puzzles and I tried the whole edge concept and corner pieces and to no avail... she likes to start in the middle. She understands the idea of the outer edge and when she gets to the corner piece or the edge she will tell me what it is but doing it first doesn't interest her.
I can say this. I have found that the wooden puzzles from Melissa and Doug are her favorite and they come in a wooden trays so I think that helped. And I am not sure if Tuesday Morning is a national chain or regional but if you have one near you see if they have the puzzles because I found them at the store for half price.
Also I talked about and showed her the importance of the picture and aligning it. So I showed her the trick of holding the piece over the others and comparing the image looking at colors and patterns. Once I showed her that it was a light went off and she had no problem doing the puzzle. She will still have it turned wrong on occasion so I have to say turn it and no problem. And I really think she could do it just fine with out my comments but I would probably need duct tape to stop that one!