Agree with Dunster ... if the length of fabric that you have is equal to or greater than the yardage that EQ calls for ... then you should be able to cut the borders on LOF.
You can also do some math of your own of your own to make sure have enough for blocks after you cut the borders.
One way is to calculate the remaining total square yardage after cutting the borders from the LOF. Then calculate the total square yardage of the pieces you will need for the blocks.
Or if it is strip pieced ... calculate the remaining WOF and LOF after cutting the borders then calculate the strips you will need from the remaining cloth.
I typically use one of the above methods with most every quilt I make (or block if I'm making single blocks for a block swap). One reason is that I have never used a pattern straight out of the box. I either make my own, or change an existing pattern.