Badger has some suggestions for you:

I would like everyone, including myself, to use less self-deprecation, in their blogs, blog titles and descriptions, posts, emails, conversation, and life in general. How are you gendering your self presentation and what survival strategy is this? Do you need it? Is it working? Are you doing it on purpose? Consider.

Very helpful lists of phrases/words to avoid; for example:

Disclaimer phrases to disavow responsibility
* I think
* Maybe
* I don’t really know, but
* I’m not an expert, but
* I’m not sure,
* You’re probably much better at this than I am,
* I don’t really understand