The tri, LS2 is fairly straightforward, except that you don't have a pic of it in the book, because the wrong photo has been printed in its place. I appliqued my top tri piece, but you could machine piece it if you put in a few seams.
K 1 is either squares or half square triangles, so you just have to be careful with placement. After I forgot to mirror image one of my blocks, I gave up on that, but if you are mirror imageing take care with the placement.
B 9 looks fiddly on the face of it, but you could simplify it if you applique the central square after seaming straight across behind it. Come to that, you could also applique the corner triangles too.
With B11, I seem to remember that I made one of the alternative versions that struck me as being a little easier. Check this out on your software and see what you think.
B12 I hand appliqued throughout. Everybody has probably takled some melons by now, so I hope you are all getting used to doing them.