I pull the magazine disconnect (they aren't a "safety" and I refuse to think of it as such) on a 9mm Hi Power that I had. Yes it helped the trigger pull. The trick is to replace the trigger return spring with a Wolfe extra power spring.
My current Hi Power still has the disconnect in place. I have tossed around the idea of starting to shoot matches again and thinking that since the gun is chambered in .40S&W it would make a good limited 10 pistol. If I were to go that route I would probably pull the magazine disconnect out. Makes it a lot easier to show clear and drop the hammer.
And as the current owner of that HiPower I will say that the trigger is sweeet!
I've always removed the trigger but the trigger pin can sometimes be a B to get out. Also I can't remember but there may be a specific direction to drive the pin it's been awhile.
Mine would not pop out without pulling the trigger. Some the plunger just comes right out.I have done it both ways on my FEG copy/clone.
IMHO NOT pulling the trigger assembly out is easier.
The whole thing tended to fall apart while trying to reinsert the trigger housing pin.