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.
When it comes to blogging, there is no such things as mistakes!! It's your blog. I am not one to hold back, I am honest and forward. It is my blog :P