You mean something along these lines? (as an example):
With background -----> w/o background
For reference see
this thread.
I note you mentioned that your source images are "very high quality" and naturally we always want to keep them as such. But that term means an entire range of different things to different people. To me, "very high quality" means a true-color image with minimum 300-dpi resolution and WxH dimensions of 2500 x 2500 pixels or larger and stored in a
non-compressed image format (IOW, no JPEGs!)
But that's just me.

To some people any image that fills their screen is "high quality". I'll assume you're somewhere in between those two extremes.
Just how critical is this project? If a job, a marriage, a friendship, or a life hangs in the balance of this photo edit, then hire a professional. Surely any one of those four items is worth a few bucks. But if this project of yours is not exactly
that vital, and if you're confident in your abilities to tackle this, then "let's go!"
First, go through that thread I linked to (just under the image above) and read &
understand the information I'm giving to Martoch. Especially any advice regarding Layer Masks. Layer Masks are the first key to removing any part of an image, be it background, foreground, middleground, whatever. Don't scoff at my instructions to "read the Photoshop help".

And although I often am a wise-a$$, this is not the case here. I gave a very specific section of the PS help file that needs to read and hopefully understood before proceeding. Alright?
After that, come back here and pose some more questions about what you need help with. Remember, the more precise and detailed you make the question then the more precise and detailed will be the answer.
Post again as soon as you got a grasp on the layer mask concept. Approx. time it'll take you to comprehend Photoshop's Layer Masking techniques: as little as 5-20 minutes or possibly even a few days or more…somewhere in the that range.

Hopefully it won't take ya too long, I'm (and I'm sure others) are eager to help.

uT