I'm a tad embarrassed to admit it, but after like nearly 40 minutes of trying to do something with loops, I decided to just brute-force the solution by using ++ + - and > to manually update each memory cell to match the corresponding input. I've been looking up guides and tutorials, but I think I'm most likely not wording my searches correctly haha... Hopefully, I'll get the basics down and then I can go back to this and try a proper solution!
Haha, well whatever works, works :D but really, it's a fairly simple idea: read the values, subtract 48, and do all that in a loop. If you want a spoiler with explanation, I put the solution here: https://hypnoticowl.com/misc/read-ascii.html
I figured while I'm at it, I might as well put together a guide for the other challenges too, you can find it here if you need it: https://hypnoticowl.com/misc/bf-man/
Thank you so much! I know I've said this already, but this has been a wonderful introduction to learning Brainfuck. After I get comfortable with BF, I'm actually planning on learning Fortran next. My reasoning is that if I can understand the esoteric nature of this language, I can probably handle learning Fortran!