My biggest mistake so far has been jumping on board with a brand partnership (out of sheer excitement that they wanted ME) without demanding more details about compensation up front. What I learned, is that just because you've been asked to work with a recognized brand, doesn't mean that they are prepared to roll out an organized campaign with fair compensation. Disappointing, but, next time I will know which questions to ask!
I found that having blog breaks can be good for a person. However, I have learned from experience that taking breaks can make you loose readers. Now I try to schedule posts, if I know there will be going on a certain day or week or what ever. So if you have a few extra minutes write up a couple posts and save them as drafts or schedule them right away. I like to have a couple drafts (that are full of "unrushed" content) It will be as if you never left.
I am new and still learning, so I am sure I am making many mistakes but not sure what they are yet...