Haha, so I have some a little ridiculous to admit. I have been using the tiny screwdrivers that come with the rdas. To build with this whole time. I keep having problems with my post screws untighting and get atomizer short messages. I ordered a better screw drive to take apart a broke mod. It came with a flathead bit. So I decided to use it to build with and come to find out I wasn't tightening my leads enough with those tiny screw drivers. What are some of the biggest mistakes you have made when starting out building?