I’m applying for a job which would require me to have a Windows computer to work from home. If I get this job, I would have to use my own computer. I have a SSD and a larger HDD. What I would like to do is to put Windows on the HDD. How bad an idea is this to try to do? I realize it will mess up my grub boot. How hard will it be to get my EndeavourOS to boot properly again? (I need a job, but I’m almost hoping I won’t get it so I don’t have to ruin my perfect computer haha)
What job requires you to have a computer but doesn’t also provide one? That’s interesting.
Is it a desktop? I used to have separate SSD in one computer, one with Windows, one with Mint at the time and I would just use the BIOS if the computer to boot into respective disks.
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Ummm - I would install rEFInd before Windows - then if grub goes, so what? (you could fix it easily after booting with rEFInd anyway)
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Separate drives you can just select from boot menu in bios. If you are that worried just unplug the SSD (while the system is off 
) and install windoze on the HD.
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Not hard.
Prepare partitions, install Windows, restore GRUB.
Just make sure you have a Linux live installer environment prepared…
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VOIP tech support 
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Customer service, but yes.
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You didn’t state if your computer was a laptop or desktop.
If it is a desktop, I would highly recommend for reliability to do as @fbodymechanic suggested and use two separate storage devices and use BIOS (usually F11) to boot into the desired OS.
Pudge
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Once Windows is installed, boot Endeavour (with the Windows disk connected) and run the following:
sudo pacman -S --needed os-prober
sudo grub-mkconfig -o /boot/grub/grub.cfg
That will add Windows to the GRUB menu.
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Personally, because this is what I do for work, I’d run Windows in a VM. That way you get the best of both worlds.
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I’m running a laptop and am concerned that I don’t have the hardware to support that. I have only 16GB of RAM for example, when that’s the minimum amount that they state they need when I applied
Linux uses so much less RAM compared to Win10, you can give windows 8GB and be fine. Start with 2 cores & 4GB and see how it is, bump it up incrementally if need be.
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I have a laptop, but I did install it on my HDD with EndeavourOS on my SSD. Everything seems to be fine, except that Windows has already frowny face blue screened on me.
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Installing Windows after the fact
Euw.
After, before, next to, above, below… all the same; euw.
Good luck [ps: your employer sounds quite sucky].
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If your job is not some 3D modeling or game dev, but rather simple communication or something light - i’d make VM (VirtualBox is easy), not to mess with whole dual-boot thing!
I’d never accept such job though, it’s like insult 
When applying to new one i always first state: “If you want me as a professional - prepare for me to newer install / use: Windows, Skype, Zoom, TikTok, Instagram etc.” 
And i don’t hesitate to walk away, if it’s “required”, usually when you do so - some greater opportunity without bs comes out fast anyway 
But you know, just personal experience 
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You could install W*****s on a separate drive and not mess with dual boot (i.e. not use grub to boot W*****s).
Though, I believe that malware called W*****s belongs locked away in a VM, and not on real hardware.
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As the OP mentioned, some hardware can’t handle VMs comfortably… so a dual boot of SOME kind is an answer…
Separate drive is a good idea, and rEFInd would handle that too, if desired - to save a BIOS trip every time the boot needs to be switched…
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…or acquiring better hardware capable of running W*****s in a VM.
Hopefully, this job will come with some sort of a salary, so I think it’s a good investment not to have malware running on real hardware.
But that’s just my opinion
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I’m struggling to discern your sentiments here. Some people should learn to get off the fence. 
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He’s going to get paid - but why create further misery by making it run worse? Besides, maybe it could be “Wine’d” after he runs it a while 