I'll probably be repeating much of what has been said in this thread but what seems to work for me the most is tutorial videos on YouTube. I'll watch a number of tutorials on a single subject, i.e. carrier landings, then head over to the game and try it out while the tutorial video runs on a tablet. Notes do help, as do knee-board checklists, but then everything becomes automatic after a while.
Next comes the endless practice but it's no good practising if you don't analyse your performance so watch the tracks after a flight. Figure out what went well and what went wrong and why.
Understand why you were successful and recreate those conditions.
Jump into one of the non-combat or non PvP servers online and practice with others. Ask questions in chat (LCtrl+Tab), people are happy to help in my experience. It's also much more fun practising online.
What also helped me was investing in some kit. I was never going to air to air refuel with an old joystick with a 50% deadzone so I found a second-hand TM Hotas and A2A refuelled first time using it.
Constantly resorting to the keyboard with its key combinations was a ballache, the Hotas and a cheap head tracker (Track Hat) helped a lot.
I've also decided to stick to one module for the time being.
Flight Sims are a steep learning curve but that's what makes them so rewarding.