OM, I have a couple of questions for ya:
1-Do you own the full version of Kontakt?
2-Do you know much about MIDI control?
3-How much do you know about orchestration?

1-IMHO you don't need those high priced libs for your compositions. The full version of Kontakt (if you don't already have it wait for a sale and get it around half off) and some of its libraries are all you need. There are a ton of third party libs for Kontakt. You have heard many of them in my compositions.

2- Controlling MIDI is how you create realism. Even if you did purchase a high priced orchestra lib it still would sound static without some MIDI manipulation. I number of years ago a guy did a classical piece of music using a GM orchestra and it sounded like a million dollar lib. I looked for it last night but couldn't find it.

3-Orchestration is the key to having a lib sound organic. This is as important and #2.

Other questions would be what type of guitar sound do you want. If you have a MIDI guitar track but don't like the sound then Blue Cat's RE-Guitar is what you need:

https://www.bluecataudio.com/Products/Product_ReGuitar/

If you know all of the above then sorry for the redundancy.

PS - A Whiter Shade of Pale with a full orchestral and choral backing is absolutely fantastic!

I think my wife has started to show the first signs of dementia.
She said she can't remember what she ever saw in me!

64 bit Win 10 Pro, the latest BiaB/RB, Roland Octa-Capture audio interface, a ton of software/hardware