With it being a new rifle and not previously stripped, as everyone else has said, yes, remove the trigger unit. There's a good chance that the end block is very tight and it may require some serious persuasion to get it started. Again, as above, a nice, sturdy steel bar with the end block protected should do it.
If it's a new gun for our power limit, there's a very good chance that static preload will actually be minimal. But better to be safe on your first venture inside. Standard stroke + lots of preload = way over the top power in an '80 if it's not a weedy but long spring.