I finally finished up reading the Speed of Trust and have to say I struggled with it. I'm a big believer in trust, it's an incredibly powerful tool (much like The Force!) that takes a lot of effort to earn, and interestingly, very little effort to lose. The book does talk about trust, but to me it covered more ground than just trust - call it side affects of trust, that while interesting (and you may find valuable), just didn't seem to resonate with me. I think it felt like I got something different than I expected, and hard to blame that on the author.
If you've never thought about how trust impacts your life it's worth taking a break to do so. I'd argue that in most cases trust is often more valued than raw skills, and trust reduces anxiety in all situations - and the lack of trust, well, that's enough to cause stress all by itself. I've never found being trustworthy to be all that difficult, just a matter of deciding that your word matters on things large and small.
Get the book if you want to explore the variations of trust, but if you've already adopted a philosophy of trust you may not find it useful.