hi Ann, always add at least 7/8" to the finished size of the hst you need. this will also give you enough for the seam. so for a 2inch hst when its in the quilt, start with 2 7/8" sqs of fabric. two different fabrics back to back, draw diagonal line across and sew a scant 1/4" either side of the line, then cut on the line. press towards the darker fabric.
you can start with strips of 2 7/8" wide or bigger sqs/rectangles of an appropriate size. i'm off to find some of the urls i got in my favs folder with pix of some of the various ways.
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geez, half the sites i got bookmarked dont exist any longer, how rude!!! hopefully these two, arghhh only two sorry bout that, will show you an easy way for you.
by the way if you dont trust your scant 1/4" or just want to err on the side of caution, cut your starting sqs at one full inch bigger than you need. then you can/might have to trim afterwards. hope this all works out for you. good luck, jeanne*