I fell in love with emulating last summer. My one complaint is that multi disc ps1 games ask for disc 2, and no matter how many tutorials i watch on YouTube, i just can't get it to work...
I mostly use handheld emulators, so not sure about one's experience on the computer. In my experience, RetroArch makes it easy enough to swap discs. It's not obvious how without instructions, but once you find those online it's not hard to do. Try RetroArch if you have not yet done so.
I am on retroarch. Did all the steps to put the discs into a single folder. And reading your comment has made me realize i forgot to eject, and load. I'm a major dumb...