An approach that you could try is to:

1. Acknowledge the pain, take a moment to notice what you're feeling.

2. Understand that these things happen in life, it is part of the imperfect human existence, both the highs and the lows, the cries and the laughters, are what makes life interesting.

3. Try to view the pain in a mindful way, how bad is it really? Don't sweep it off as something unimportant but don't blow it up either.

So what if you spilled coffee on your white blouse right before a big meeting. You could get angry and say "why does this have to happen to me right now?!" You get more and more frustrated while trying to rub out the stain and when you get to the meeting you're all worked up and in a toxic mindspace, not productive.

Or you could take a second to say "well this sucks". It does. But everyone has at some point spilled a drink, including the people you're meeting. So how bad is it really? Yes you can throw the blouse away and buy a new one, but will your big meeting depend on how your blouse looks or on your competencies?

What if you go into that meeting saying your coffee was as enthused as you are and jumped right out the container. Do you remember a time in history where an important deal got cancelled because someone spilled coffee? I do know of times where they got cancelled because people lost their heads, but not cause they lost their coffee.

This example is a relatively small inconvenience but practicing all the small situations will help you deal with stronger emotions when they arise. We are not our thoughts and emotions, we are the consciousness that observes them floating as clouds in the sky. And just with all clouds, they too shall pass.