They look harder than they are !! Some patterns are more time consuming than others, but its all straight sewing, no curves , no Y seams .
Its a matter of staying organized . My first one I really just could not wrap my brain around the un-sewing part.... now ... I love it , one of my favorite methods. Don't know why I was reluctant when there was nothing to be scared of. Do take the time to read the directions and go step by step.
If you can sew a 1/4 inch seam ,and cut accurately you can do it.