You will find enough examples of people turning their tragedy into an opportunity to realize that it can be done.
Will it be easy? Absolutely not! Will it be impossible? Absolutely not! The task will be very difficult, but not impossible.
You want to start by creating clear goals with your team to get them engaged and committed. This will be followed by working on the roadmap with timelines to go from where you are to where you want to go. Here some assistance from people who have been there and done that can be extremely valuable.
Once you have clarity of goals and a roadmap then execution is the name of the game! This will get you up and running with no time for brooding.