Sometimes it's best to just alter the pattern. I've made several postage stamp quilts, tablecloths, etc. I found by alternating the seams from row to row, there's a whole lot of stress alleviated. Simply have the seams from one row fall in the middle of the square from the previous row. Makes life so much simpler and I must say that the look is, if anything, even more "postage stamp" looking.
Be kind to yourself. Enjoy your journey.