I've thought about this alot, and I do disagree. I know I am certainly not self obsessed, I have an overwhelming desire to change my outside to reflect my inside, because at the key of the issue is I want to be seen as female. At this point I have already accepted that my mind is female, so in many ways this involves the perceptions outside of my own mind as much as it is inside my own mind.
It may be true that it can hurt other people to go through transition, however the reason why they are hurt is not you being gender A instead of B, the reason why they are hurt is because they are used to a façade and it may be difficult for them to let go of that façade, but had you been born gender B instead of A they would have loved you all the same, so the problem is that people have trouble dealing with change.
Though I haven't told my mother about me being TG, I know had I been born a girl she would have loved me the same. So if it comes down to her having problems they are really of her own creation, not mine.
Now, it is true to a certain extent that you have be selfish to go through with transition, in the same sense it is selfish to follow your heart and dreams rather than just being who other people want you to be. What I am saying is anyone really secure in who they are has to be a little selfish, and there is nothing wrong with that.
Now, I am sure there are a few transwomen or transmen that are totally self obsessed, and a few that are OCD, but I am not sure that it 'comes with the territory'. I am not an expert on the issue and as always YMMV, but I would love to hear some other opinions on the subject.