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: 79 x 159 stitches
Sewn Design Size: 5.6 x 11.4 inches or 143 x 289 mm
Suggested Material Size: 11.5 x 17.3 inches or 293 x 439 mm
Stitch Style: Cross-stitch Using 2 strands