Remember, cross-stitch is considered counted embroidery.
So count count count count again and double check your counting. It really helps minimize mistakes.
Gridding save you a lot of time (and your sanity too). Cross stitch is meant to be relaxing. Make your hobby hugely beneficial for your mental and physical health.
Material Type: Aida Generic White
Sewing Count: 14/inch or 55/100mm
Design Size: 40 x 36 stitches
Sewn Design Size: 2.9 x 2.6 inches or 73 x 65 mm
Suggested Material Size: 8.8 x 8.5 inches or 223 x 215 mm
Stitch Style: Cross-stitch Using 2 strands