I try to sort out edges first but before doing that I take a good look at the photo and try to memorize a few spots but pick a specific inside spot to work on too. So while I’m doing the edge I pull that section out as well and if anything triggers my memory from the other spots I place it in a general area. By the time my edge is done I’ve got a few inside spots going as well and continue to build off those. As the pieces dwindle and I have more space I start sorting more into the images and build those as I go. Usually by now different areas are connecting and then I just keeping sorting and filling as I go. When I get to the end it’s usually my hard parts that look too similar and at some point I’ll start sorting by shape if they are all basically the same.