The Klal of ha'Mispalel b'Ad Chaveroi Hu Nehena Techila does that mean that if I have the same problem I will only daven for my Chaver? That would violate the Chiyuv to be Mispalel if you have a need. Several Roshei Yeshivas told me that I would still have to Daven for myself too. If that is so what is the big deal of being Mispalel for your Chaver, if you didn't give up anything?
1. It all depends on a person's feelings. Chazal cannot obligate a person to pray first for his friend, but if a person has an inner urge and feels that it is more important that his friend's problem should be solved than his own problem, then as a result of this genuine feeling the Torah promises him that he will not lose as a result of praying for his friend, but, on the contrary, his needs will be taken care of first, even though that was not what he seeking. This is Midah k'Neged Midah: since he put his friend's welfare first, Hash-m in return puts his welfare first.
2. I found that the Yad ha'Melech (on the Rambam, Hilchos Tefilah and Hilchos Nesi'as Kapayim 14:12, DH v'Ra'isi) explains this very clearly. He writes that if a person has developed his heart and his desires so much that his friend's well-being is more important to him than his own, and as a natural result of this he voluntarily prays for his friend's needs before his own, then Hash-m rewards his pure heart and answers him first.
3. I want to compare this to what the Ramban writes in Chumash on the Mitzvah of "Love you friend as you love yourself" (Vayikra 19:18). The Ramban writes that this is an exageration, because a person cannot love someone else as much as he loves himself. In fact, Rebbi Akiva taught (Bava Metzia 62a) that one's life takes precedence to anyone else's life. Rather, the Ramban writes that the purpose of this Mitzvah is that one should totally remove jealousy from his heart and he should want that his friend should have all of the best things in the world and enjoy a better life even than himself. Even though, in practice, a person must put himself first, the desires in his heart should be that his friend should experience as much prosperity and welfare as he experiences.
4. In a similar way, even though a person certainly should pray for himself, he should try to work on himself and acquire the feeling which will lead him to want to pray for his friend first. His heart should be so pure that he cares about others more than he cares about himself. He does not do this deliberately as a way of receiving the reward of being answered first; rather, when Hash-m sees that he genuinely cares about others more than himself, He will give him a reward that his prayers for himself will be answered first.
5. I found a different explanation, which I suspect is closer to your reasoning, in the Sefas Emes (Devarim 5651, Rosh Hashanah, DH b'Nusach ha'Tefilah). He writes that the teaching that "ha'Mispalel b'Ad Chaveiro" is answered first applies only when he is afraid that his friend may have recieved a punishment because of him, in the same away that Avraham Avinu prayed for Avimelech. Otherwise, there is no logical reason why he should pray for his friend if he needs the very same thing for himself.
Kol Tuv,
Dovid Bloom