The challenge was to learn how to do the loops and the fillers they were both those kinds of things that look much easier than they already are until you've done them several (dozen) times. Then they start to make sense and that's half the battle. Then you do them several (dozen) more times and then you may be able to do them and be happy withe them.
On the first loop, I discovered that once I work the beginning of the loop, I wouldn't be able to see where the hole pricks are for the end of the loop. Also, once you work the end of the loop, if you're not careful, you will work over top of the pins so when you get to the end, you have to figure out how to get the pins out.
All 4 projects done and lessons learned.