@Elina@queer.af that's similar to me me - I've played the vanilla game as defuser and as expert quite a few times, to the point where (a few years ago when I last played) I had accidentally memorised some of the manual.
I attempted to play modded with people once, but it did not go well.

If you're used to being a defuser, that's actually good! I lost my copy of the game, so it's easier for me to be expert at the moment.

For mod setup: I have a guide + set of intro to modded missions