Oh ok. I think I got the first part!
Let me edit this and reverse it and I will share how to do it and help those that need it. Give me a minute, figuring it all out.
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Step 1: Open your Hex editor (Mine is HxD) and open your Switch file ff8slot00
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Step 2: Look at the first 4 bytes: this tells you how long your save file is, no need to convert: Mine is 26 09 00 00 (read right to left) 00 00 09 26 Mine is 926
(If yours is something like: 34 08 00 00, it will be, 00 00 08 34 = 834
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Step 3: Select 04 (byte)
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Step 4: In HxD I can right click and "Select Block" a byte: type in 926 (yours will/could be different)
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Step 5: It will highlight a block of code. Copy this and Ctrl+N to make a new file
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Step 6: Paste the block
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Step 7: Save the file to ff8slot00.ff8
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Step 8: Open in hyne
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Edit how you like!
Figured it out!
Step 9: After you have made the changes to your save file in Hyne. You will open the save back into your hex editor.
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Step 10: You will see the new file size, mine is 00 00 09 21 = 921.
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Step 11: Copy all the info, Ctrl+A
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Step 12: Go to the ORIGINAL ff8slot00 file from Step 1.
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Step 13: On byte 04 in my ORIGINAL ff8slot00 the byte is 22. Highlight that.
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Step 14: you will now right click and "Select Block" again. Now I would type in 921 as that is my new file size.
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Step 15: Paste in the new info Ctrl+B (Paste Write)
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Step 16: This left me with 5 bytes of extra data that was now not needed. I just typed in 00 00 00 00 00. This cleared the info on the end of the save file.
Step 17: Load your save file and if you did it right, you should be able to play the game with your new edits.
Notes: Your save file should be 10,244 when you are done editing. If it is lower or higher, you will need to go in just after your save info and add/delete some bytes. 1 byte per 1 you are off from 10,244. This should fix it if it is not loading or you are getting an error trying to boot the game. This is what happened to me and this is what I did to remedy it.
I hope this helps. Please feel free to message me if you need help!