Getting out of your comfort zone is good, but taking on too much too soon can lead to abandoned projects or even worse, burnout.
Testing is good and we like it. However, testing every single thing can take too long and become tedious. While inching towards 100% test coverage you may find that some tests have a very low value-to-cost ratio.
Trello is a generic tool that can organize almost anything. This is how I use Trello to know what I've done to my car.