There is no one-fits-for-all installation order for FSX; especially when you have a number of addons to follow.  Here is the order I took.  Note that my FSX system and addons are stored on separate SSDs.  Moreover, I used Acronis Home Image to backup each stage of my installation, just in case I need to go back to any point for any reason.

FSX-01-FSX Deluxe
FSX-02-FSX Acceleration
FSX-03-Scenery Tech Landclass
FSX-04-UTX USA, Canada, Europe and Alaska
FSX-05-GEX USA/Canada and Europe
FSX-06-Real Environment & Active Sky Evolution
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