Lets get this out on the table first off I am a rc heli noob. I know very little so If i say something stupid or don't know something this is why.

I wanted to replace my black swashplate with the glow in the dark one that eflite offers. I broke the black one taking it off, I broke the new glow in the dark one trying to put it on. I went back to the LHS and bought another black and glow in the dark and broke the glow in the dark one again. I finally after breaking three of them got the last black one to work. Am I just stupid or is it REALLY hard to replace this thing without breaking the stupid little balls off the end of the swashplate?

I put it all back together and when I fired it up it flew horrible. The nose would turn far left and the whole heli would go left also. I used the trim settings to fix it so it was able to fly decent but its nothing like it was before I started takin it apart and puting it back together. Any idea what I might have done wrong when putting it back together that would cause this issue?

Thank you for any help/suggestions/comments you all have to offer!

The MCX is a very durable heli for its size but can be very delicate in working with the mechanical componets.

You need to be patient and thoughtful how you are going to remove certain parts. The key here is finesse, gently
and carefully. The swashplate little balls can get broken if you pull too hard, to snap off the links use a small
tweezer to push the little ball out from the links, if you use your finger chances are something is going to break,
an average hand can be too rough with these tiny helis so you have to be extra pateint and careful.

Also when working the mechanics you have to becareful not to distort the blade shape this can rob you of lift and it will show up
in the heli wanting to yaw in one direction more than the other. Be careful around those tiny motor wires these can get broken easily if
you pull too hard on something.

CHeck that the main gears are not binding
Check the blade shape again
Retrim your transmitter

if your motors work and the heli is fairly new then it is probably something mechnical or just needs to be trimmed.
Sounds like you already cover the re-trimming prt, so what exacly is it doing that is so terrible and doesn't fly like the first time?