You've been using the simulator to help the learning, so keep using it. Practice using the rudder on takeoffs and landings for runway alignment. You need to rely on the rudder for that no matter where you are in your learning.

It's not like it's a really difficult skill to learn. It isn't. And rudder is what you need to be steering the airplane with on takeoffs. It keeps you from killing your airplane. So is it needed to begin with? If you wish to keep from causing takeoff crashes, yeah, probably. And if you want to keep from causing tip stalls into the dirt on final, you betcha.

When a model is near stall speed it's best to do yaw correction with the rudder. If the airplane is just reaching flying speed and needs to be straightened back onto the runway, if you give it aileron/elevator to turn, you're increasing the chance one wing will stall first, and that the plane will stall. Look around these forums. There must be a billion posts about just exactly that. And a couple of trillion about tip stalling on landings. And the bottom line is you steer the airplane on takeoff and landings with the rudder when the airplane is slow and low.

You need to learn to use the rudder? Yeah. Unless you don't plan to takeoff or land.

And your sim will help bigtime. BIGTIME..... crank in some crosswind and have at it. Won't cost you a dime. And since you've got Real Flight it's easy to vary the wind direction. So while you're practicing, change the direction every so often.

BTW, dial in some appreciable turbulence while you're at it. It significantly increases the reality of the practice.