Yes, work backwards from the current stitches at the beginning of the row, go forward at the end of the row. It actually says to increase on the 3rd row, then every 4th row after that, not on both the 3rd and 4th rows.
"Inc 1 st at each end of 3rd and every following 4th row". With the each and every in there it looks like both, but 'each' refers to each end, the every refers to the 4th row.
sue- knitting heretic