But I don't understand WHERE to stitch. In stockinette there are the Vs and the ladder to guide you. I'm totally lost on this purl edge.
Garter stitch is just knit stitch ad nauseum, and knit stitches tend to have the little 'v's
. Try and work within those 'v's which is one stitch in behind the bar or the edging
, ala reverse stocking stitch, and it should help.
ETA- this video explains it better than I do. There is also a purl edge which is similar to what you are doing. HTH! http://www.youtube.com/watch?v=0k460JhPD4M