1-remember to leave the zip open when fitting the last piece (slight panic on the first one when I was wondering if I could open the zip from the wrong side)
2-overlock the seams as you go
3-overlock the edges before adding the zip, give you a neat edge to align the edge of the zip, and you won't catch the zip fabric trying to keep it out of the way when you overlock last.
4-leave the zip longer that you need until after you've attached it to fabric, it's a lot easier to attach with the zip closed (shame I found that one out on the last cushion!)
5-don't throw away any pattern pieces until you have completed the whole task (horrible feeling to realise you needed two t cushion covers, not one, especially as the paper recycling had already been collected)
6-when ordering fabric, remember each cushion has a top and a bottom.
I don't know if it was finding my rhythm or the cooler weather we had this week, but it was a much more pleasurable process this week. It definitely went a lot quicker this week, and maybe starting on the hardest shape helped too.