Thank you! And may I also add for tablet users - there is no brush that will suddenly make you a better artist! It bugs me when people ask 'which brush are you using' in an attempt to get some insight into suddenly becoming a good painter. There's no magic trick, only practice and experimentation.
I applaud you! I have been telling a few people this as well, and some of them take it to heart, but a few others get mad at me for pointing out the truth.
I made these same mistakes. It wasn't until I started practicing, studying, using the darn shoulder and elbow instead of the wrist, and gaining confidence that my lines started to look clean and looked like they were meant to be there and not just some random floating chicken scratch. xD
Sometimes I've noticed that when I'm using my tablet, my lines get wobbly. I'm still getting used to my tablet, so the other day I realized that my lines look a lot better if I'm drawing more gently and not pressing down so hard. Still, it's harder to get precision when drawing with a light touch... gah!