I installed Bazzite about a week ago. Other then the Nvidia performance not being quite as fast and me not having figured out what I am going to use for design for 3D printing yet, my biggest problem has been that I can’t seem to get the setting for a custom login screen image to stick.
So all in all it’s been pretty painless.
I unplugged the old drive and installed on a fresh one. I’d heard that dual boot installs could be finicky, so I just avoided it. Sorry it didn’t go smoothly for you.