I have been doing a lot of cross-hatching in my last few quilts, always using the blue painters tape. This time though, I decided to heck with marking it and to just wing it... and I must say, I just love the wonkiness that is happening! It is turning out to look like it was planned that way. LoL! It helps that the stitching is done in an uneven spacing, wavy-like way but really has a folk-ish feel to it. So, my advice is to step out of the box and don't fret so much on perfectly straight lines as that tends to gets boring and mundane after a while. Just have FUN, and keep it fresh. Good luck to ya!