I went the same route as you are doing, got a sim and spent ALOT of time on it before taking a trainer up (PT40). I was fully prepared to crash the 1st time out, money and ego wise. But it has survived so far, and am onto other planes. But I like to learn things on my own, even knowing sometimes it will costs a lit' extra.
Yes one can teach themselve to fly successfully, many have and many more will follow. But I will agree with the majority, it is probably better to use an instructor.
Good luck!