We have a PreSonus "Studio Live" 24.4.2 sound desk.
Yes it looks complicated, but like most things, if you tackle new stuff a bot at a time, you eventually get there.
Buit remember
The links below are to some training videos which point out the main features of this Sound Desk.
Check out the first few, concentrate on the volume mixing side of things, and then once you are more confident, work through the rest (6 and 7 are less used features) when you are ready.
https://www.youtube.com/watch?v=ai3jCI6UmiM&list=PLnhV9g9pM2IHrlYwVLGBNDJ-UQw8c4z0j