Often times, people go hours (or even days) with nerves that are unsettled before they even realize that this is the problem that has been plaguing them during this time; because of this, the first step to calming your nerves when they are unsettled is to be able to identify when your nerves are rattled – after all, you cannot fix the problem until you know the problem exists!
Once you have successfully identified the fact that your nerves are unsettled, the next thing you will want to do is search back through your memory and figure out exactly what it was that caused you to be in this state; when you do this, you will be able to pinpoint exactly what it was that caused this problem, which will make it a whole lot easier for you to make the problem go away.
And in order to calm your nerves, the final thing you will need to do is this: take the thing that unsettled you in the first place, and put that thing out of your mind, working to usher in calming, soothing thoughts instead. Even though this is, naturally, not always as easy as it sounds, making this conscious effort to dwell on positive things instead of on the negative will go a long way toward allowing you to unwind when you are in that tough position of having rattled nerves!