haha, don’t worry about it man, a lot of people new to repairing switch’s have trouble wth this connector and sometimes it just takes a few tries to get a feel for how to slot it in.
tbh it’s not even totally your fault, these Molex connectors are poorly designed… this was part of a “new series” of connectors according to Molex in one of their press releases… translation > “this is a poorly designed connector that has not been properly trialed elsewhere or have a proven track record and is likely to be unreliable”
If you can bend the pin to a point where it is not touching any of the other pins and then test the corresponding pad at the back of the connector in diode/resistance relative to ground and it show OL (in both polarities) then it would suggest the pin is a no connect (NC) and it’s safe to just remove it, I’d wiggle it until it fatigues and breaks off.
On ribbon reinsertion/s, just keep the ribbon as low as possible in the slot trying to keep it as parallel as possible, if you feel any resistance at all just back it all the way out and try again, the pins can only bend if you take them past a certain point of force when pushing the ribbon in, if they never get the force they’ll never bend 
btw did you have any joy replacing the SD pin?