We had a recent Practice Bakes Perfect challenge about piping circles (https://cookieconnection.julia...challenge-27-circles), which you might find helpful. The challenge intro (previous link) gave some useful resources with tips for piping perfect circles. Also, if you search the Blog section of the site for that Challenge Recap, you'll see some of the results of that challenge where members discussed the methods they had the most success with.
Regarding epic fails: we all have them. My best advice is to do what you're doing (seek advice, practice, and find those solutions that work best for you) and then find creative ways to hide those fails (or eat them)!