I have managed to do my sample square and sort out the uneven edge probs with your kind help, and have taken the plunge and done the first 2 rows (eek!).
It looks ok, but I'm rubbish at maths and not sure how to work out if I have the right number of treble chrochet clusters . I cast on 90sts, and now have 28 tr clusters and a 2 tr either end. In the sample pattern lucy cast on 21 and had 5 tr clusters with 2 tr either end. Please tell me it's going to be okay [hides behind sofa too scared to look].
I've tried to work it out but have used up all my brain cells trying to pay attention to the foundation chain and 2nd row!