Simulators do that - after I was able to keep the sim trainer in the air, I jumped to turbines on the sim. To me they were easier to fly. Now, could I have flown one then? Even now? Definitely not then and even now I'd be scared to death of the speed.

Simulators help wtih being able to deal with control reversal (plane coming at you versus going away from you), they help you instill "muscle memory" where you don't have to really think about doing something - you just do it. Sims are great for working out new manuevers and practicing but keep in mind they are just a "SIMULATOR".

Speed perception on a sim is completely different. The wind blowing in your face and changing directions on you while batting the plane around is completely different. The sound of the engine running, the smell, other planes in the air - real trees! All of these things contribute to a very different feeling when you take off with a real airplane.

If you're doing well on the sim you will probably do well with an instructor but just like I said before, keep in mind this is a simulator and while it helps there is no replacement for the real thing.