I have finally got past the really difficult bit on Hearthside right slipper. German short rows on this pattern are difficult to follow because I have to keep checking what the abbreviations mean. Then if I make a mistake or think I have, I have to track back on all the rows one stitch at a time unlike normal knitting when you can often track downwards with the help of a spare needle or crochet hook.
Mind you, I mustn't get too blasé because I made a mistake on the chevron pattern with the left slipper when I wasn't concentrating on the grid pattern properly.