I've been trying to put the landing gear on for 90 minutes.
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This is exacerbated by the gear doors. They attach via relatively small, shallow tabs into relatively small, shallow slots. You must have a light touch not to knock them off (over and over) while wedging the strut tab into the mounting slot in the gear well.
Also, I strongly suggest fitting the gear actuators into the gear well before mounting the gear.
Now, all this said, I am using the metal gear. I surmise that if you use the plastic gear, that will simplify the gluing and maybe there will be a stronger bond between the teeny tabs and the doors. Or not.
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See photos and read more about this build: Trumpeter ME-262 Decaled & Gear