You're as prepared as anyone ever is. Getting good with a search engine is the best preparation.
Also, if that fails? Most distros have a forum where you can ask for help and actually get it.
Document interoperability? LibreOffice works well, and you can save in all the same formats as MS Office and more.
The learning curve is mostly what the new tools and programs are called. But so much stuff actually works better over there in Linux land - VLC, Krita, Blender, Audacity, much more.
Try things in a Virtual Machine! If you really can't give up some of your windows tools, you can try dual-booting, but Windows Update doesn't always play nice with another OS on the machine.