Consider the Esky Lama V3, or better yet the V4. These coax helicopters are easier to fly then your DF 36 and run about $100. Parts are inexpensive as well. Coax helis are best suited for indoor flying but can be flown outdoors in zero wind conditions. A step up from the Lama would be the Esky 4 channel FP at about $125. These fixed pitch helis are easier to fly then the cp units such as your DF 36 yet, offer better performance then the Lama. BTW, the Esky Lama and FP come with durable plastic blades.

As far as your DF 36 goes, make sure that you have gone over the setup and that you are using training gear. Practice flying in zero wind conditions, if you are outside, and have an experienced heli pilot help you with the setup and flying if at all possible. Your local hobby shop or club can, most likely, help you with this. The various DF threads will also have setup info and tips so check them out if you can.

FMS, while not the best SIM, is better then nothing and will at least help teach you visual orientation. I recommend that you try an FMS helicopter model download that is similar to your DF rather then fly the helis that come with this SIM. That is if you haven't done so already. Some of the fixed wing models that I've added to FMS are not so easy to fly.

P.S. Flying helicopters is just part of fixing helicopters!