I have made block 4, twice, and as a novice, have found it the hardest block so far.
I used method 2 shown on the tutorials, but didn’t know about adding an extra 1″ then cutting and squaring up. I now realise This will account for my sewn HST’s not being long enough for the centre triangles. I was short about 1/4 to 3/4″,
The second time, I used method 1, sewed the two triangles, I was super scant on my seams but I still don’t really have a 6 1/5 unfinished block.
I have now watched the HST tutorials, and will maybe do this better for all the other HST’s as I’m sure there will be more, and perhaps I will do block 4 again.