Hi, I'm making the Nach Waxman brisket and i made a mess when slicing it and it does not resemble the original shape. Will it still be ok? Thanks!

Letting the meat sit and pre slicing and then returning the pot is the way I recommend doing it. Some cooks I know also swear by a thin serrated knife to slice the meat, keeping the slices on the thin side. Regardless, it will taste delicious.

Do you mean it shredded? I am making it as I type. Just put it back together as best you can and carry on. That's what I would do. I think someone in the comments suggested it sit out on a cutting board for at least ten minutes before slicing. A few people had the same issue. A sharp knife would also be key.