I insert all screws except the one in the trigger plate and only tighten them a few turns.I use a 12" tapered and hardened rod to get everything re-aligned. I clamp the receiver upside down in my vise using wood blocks for padding.
I apply pressure to the trigger plate with one hand while rocking the top lever towards the hole with the tapered rod. Usually in a few pushes it will snap into place. I them install the screw and finish tightening the other screws.
Jim

The 2nd Amendment IS an unalienable right.