Never self-hosted Lemmy, but have self-hosted other things in the past.
While you don't necessarily need to code, you need a fair amount of code-adjacent skills. If you ever want to get into self-hosting, you should have a look into (at least):
the linux command line
ssh
how ports work
VPS providers
DNS registrars
nginx
docker (while you don't need it to host things, it makes your life 10x easier)
docker (while you don't need it to host things, it makes your life 10x easier)
...until you have a single extra space character hiding 20 lines into your compose file and the whole thing falls over the next time you try to bring the containers up.
If you are wanting to self-host outside of your home-lab and use a VPS, it is pretty simple. Ubergeek77 has compiled a docker image to easily install it all in like 5 steps. Take a look, https://github.com/ubergeek77/Lemmy-Easy-Deploy