Working with different contractors to accomplish a single goal can be a challenge, but I found that there is one company to contract with that can coordinate everything else sufficiently well that you won't need to take a roll in the driver's seat.
I never imagined a contractor would be quite so helpful.
I was shown the operation of my new window, given the paperwork with all information we would need & told to call if we had ANY questions at all. This has been the best experience I've ever had when dealing with contractors. They will be first on my list when it comes time to replace my doors too.