RE: The most common beginner flying mistakes
These tips have probably already been passed on, but if not:
Get a sim and practise; you've done that
Get an instructor for a few flights
Don't over control
When at a safe height after takeoff, about 30', reduce power so that it's not difficult to keep up with
Establish how far our your plane is; depth perception is difficult at first
Practise, and don't fall into the trap of trying too much before you're ready. No shame in flying circuits and figure 8's for a while before lopps, rolls, etc
Listen to the experienced guys who watch you fly
Constantly assess and reassess your performance during and after flying; how can I improve?
Enjoy the hobby