I made myself a portable block flannel board. I just took a piece of cardboard and made a flannel pillowcase for it just big enough to slid the cardboard in and stitched it closed. I cut my block pieces and arrange them to make the block on the board. I then carry the board to my sewing table and piece 1row at a time and place it back in the right position before doing the next row. I am not saying it is foolproof but it helps.