That's a pretty cool pattern. At first I thought it was alternating blocks -- which it is, but it is the same block in two different color ways. The center large print is the same in each block. I don't see any big areas of concern that I had before seeing the pattern. I think though the instructions would really help you and suggest you buy the pattern.
Once you have the instructions, multiply each amount by .6 or .75. With .6, round up to the nearest fabric cut. For example, two yards would be 2 *.6 = 1.2, round up to 1.25 yards. 3 yards * .6 = 1.98, so 2 yards. If you use .75 then 2 *.75 = 1.5 yards, which would give you a little extra breathing room. Likewise, 3 * .75 = 2.25. If there are pieces under half a yard you might as well just buy as halves or whatever is listed. (Having worked at a fabric store at one point of my life, I personally don't buy anything under half a yard...)