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You should not do such job by yourself if you look for professional to check it afterwards. Yes, it is not a big deal to change pads and rotors, but as you probably feel, just one small stupid mistake may be fatal. Do not hazard with your life and life of your passengers.
After changing the fluid just because it is old and saturated with water, you should not feel any change in pedal firmness. Usually the brake fluid has to be changed only because after some time it contains too much water (absorbing it from air - well, some brake fluid types do not absorb water). And if there is water in the fluid in a situation when you have to brake hard and for longer time, heat from brakes will heat the fluid, water in the fluid start boiling and evaporating. And steam bubles in the fluid are same as air bubles in the fluid - the brake system becomes ineffective right when you need it.
If you feel the pedal firmer, then you had air bubles in brake system. Or you had them and you still have them :).
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