I found little help online with this so I figured I would write it out in hopes it will help others 
This will also include suggestions and problems I've encountered. I used a
XPG Gammix S11 PRO 256GB ($67.99 CAD).
I initially attempted to clone my drive, but the adapter I purchased was not compatible - so I went with a clean install of windows 10 instead.
I created a bookable USB drive to install windows 10 using the
Windows Media Creation tool (very easy to use), you just need a 8GB USB.
Also, have a second USB with the drivers downloaded onto them - you can retrieve the drivers here (i didn't bother installing quick access) :
https://www.acer.com/ac/en/CA/content/support-product/7383?b=1&pn=NX.GSFAA.005 I installed the NVME by popping off the back plate (turn off computer while doing this, and make sure power adapter is disconnected from your laptop). Turned my computer back on, with the USB plugged in, and immediately hit F2 to bring up the BIOS. I enabled Windows Boot Manager, and changed the boot to boot from the USB.
Went to the Repair Section of the boot manager, and entered command Prompt to properly format the NVME so I could install windows 10 onto the M.2 NVME. Once in the command prompt: start diskpart
Which will bring up a second window, then enter the following (1 space before each command):
-list disk
-select disk # (enter the number where your nvme is listed, should be disk 1 - image below for ref)
-clean
-convert gpt
-create primary partition
-format quick fs=ntfs
-exit
Exit and restart to install - the disk needs to be GPT in order to install windows 10.
if the computer isn't booting the usb after restart, restart again and hit f10 or f12 to bring up Boot Manager - leave boot manager enable (important).
Now go to the install section from booting the usb - select the NVME and install - it will install reallllly fast. Once it says it needs to restart to complete install, and it has installed - remove the WINDOWS usb - it may bring up a screen on windows boot manager if you left the 1TB HHD in - the top windows version will be the NVME.
Do the following if you wish to bypass all the bloatware windows includes - do not connect to wifi, install without wifi - pretty much deny all the options they offer lol. I had to reinstall multiple times because i was encountering some issues - the drivers Acer provides are fine tuned for Acer Spin, the ones windows provide are generic - if you install the updates from Update Manager; you will encounter some problems.
So, using the USB with the drivers - we will install those first before connecting to wifi and updating to ensure there are no problems (starting with the I/O driver). I am sure you can figure out the rest from here
install those drivers, then turn on wifi and update.
Take aways for me - and things I wish I didnt do.
Seeing the boot manager everytime at start up essentially means you have 2 computers on your computer. If you select the other one, it will boot up your old computer. Also, the new version of windows you installed onto the NVME is not the same as the one on your HHD. That version is kinda fine tuned for the Acer Spin 5. I later wiped it, and regret it - its a great back up/fall back to have. Some little things with the new version i installed were different; like Acer Quick Access wasn't bringing up the feature to disable auto dimming like it was on the version on my HHD.
And i haven't even formatted the old 1TB because i am worried acers bios will attempt only to boot from that drive.
Hope this helps someone - if you have any questions, I will try to respond promptly.
