I bought a wheel the other week as well and I'm shit with it at Forza, but I think this is more down to not being able to find a table that I can stick the wheel on, so I have to have it on my lap.
That and the layout of the pedals seems to encourage left-foot braking and a right-foot loud pedal, which means that I unconsciously push the brake down whenever I change gear using the flappy paddles, thinking it's the clutch.
Will need to weigh it down so I can just use my right-foot for both pedals, and possibly learn heel-and-toe