Glue basting is probably the tip that transformed things the most for me.
I use the pin in upper left corner method but I also take a picture of what I have on my design wall and have it handy near the machine. That way if I get confused I look at the picture to confirm placement. I also use a cookie sheet to transport my pieces from the design wall to the machine and back. I find I'm less likely to get things mixed up if I lay them out on the cookie sheet.
Frixon pens are pretty neat too.