This is how I made the DD 4 patch I posted last week.
First I used a 4" wide ruler placed it so I would have 2" on each side. Cut corner to corner turn and cut corner to corner the other way. Having a mat you can turn helps immensely.
attached the middle square to 2 of the outside pieces contrasting colors..
Sewed the sides with opposite colors together.
add sides to middle.
cut and square up block.
This is what I have done so far. Hope this helps to answer any questions. If not just let me know and I will try to any questions you have.