So far the most complicated I've done are kits that were on 18 count aida which were 5x7, so I'm more daunted by anything on a higher count and on non-aida fabric. I haven't even completed anything larger than 5x7, though I am currently working on one, which is on 14 count aida.

I do have a kit that does require you to work on 28 count linen, but I'm not sure when I'll get around to that. Plus I need to work out how to use my scroll frame since I dislike using hoops.