[Misc] What are some common "Level 2 Newbie" mistakes? (aka, things you caught yourself doing when you were already a little ways into your skincare education and thought you knew your stuff)

Beauty Tips For Body Care
All the "beginner's mistakes" threads I see seem to cater to the newest of newbies but I feel like there are plenty of mistakes made by the slightly-more-advanced-but-not-yet-experts crowd.
Girls Blog 2015
Submitted by icecreamcones99