To help we answer your questions:

Writing the perfect question

https://stackoverflow.com/questions/20109391/how-to-make-good-reproducible-pandas-examples

How to create a Minimal, Complete, and Verifiable example

For self-development:

How to debug small programs

If you are bored...

https://stats.stackexchange.com/questions/423/what-is-your-favorite-data-analysis-cartoon

How can one be more confident? Add more test cases :P

Nothing makes me feel better other than that my old answers solve your problems. Please use your upvote to let me know about it!