First, I would evaluate the "why and how" of the situation that did not go as planned. This will give you great insight into what to expect in the future, and if that situation was something you desired in the first place. I notice that when I push too hard for something to occur that is not in alignment with my values, it often does not work out well.
In the past I spent a lot of time planning, back up planning, and back up to the back up plan planning. I found that in "time sensitive situations" I missed out on opportunities because I was so busy planning that I lost sight of my true desires, direction, and focus.
So then I tried moving forward without back up plans and when I failed spectacularly, I felt at a loss of what to do next. The key is to be aware of the possibilities and ultimately be flexible with the potential outcome(s). This means not "attaching" emotionally to how the situation plays out. For instance, you want to go see a specific movie, you get to the theater with your friends and that movie is sold out. Are you disappointed? Maybe. Do you have lots of other options? Likely. You could go see a different movie, buy the tickets in advance of the next showing and then go do something else in the meantime with your friends, or take it as "sign" that you were "meant" to do something different and explore what else you and your friends may be able to do instead.
In the last 5 years I found a middle ground and here are the steps I take when I move forward with big plans: - Identify what I want to occur (what do I desire most?) - Identify a few pitfalls that may occur that prohibit my most desired outcome (what could go so very wrong that I could not tolerate the outcome?) *Do not dwell too long on this step - Identify a few solutions to those pitfalls (what could I do or what resources can I leverage to either prevent that from occurring or solve the issue on the fly?)
This is how it looks applied to a situation where I am planning a trip to see family. - Desired outcome - arrive at their house and spend at least 2 hours visiting - Possible pitfalls - weather and or traffic could delay my arrival - Solutions - check weather the day before, check traffic before I leave, and plan some flexibility into my day so that I can stay my desired length of time, in the case I don't arrive when I planned.
I can't stress it enough, be flexible and allow for a multitude of possibilities to arrive in the moment, so that you allow yourself other options and or opportunities without dwelling in disappointment or "failure".