You need to be extremely careful removing the roll pin through the trigger guard.
A number of people have found out the hard way that the "ears" on the receiver will break right off if the receiver isn't well supported with a bench block.
Make sure the block has a hole big enough to allow the pin to move out.
The same goes when installing the pin. Get it slightly crooked and the pin can contact the side of the ear and snap it right off.
Break an ear off and it's not repairable.
This is one of those jobs you need to be extremely careful with and pay close attention to what's going on.
Here's pointers on removing tight pins.
Use a "starter" pin punch.
This is just a pin punch cut off to about 1/2" inch working length. This prevents the punch from bending or flexing and directs all the force to the pin. If a standard length punch is used the force may be dissipated and cause the pin to distort, locking it tighter.
Once you have the pin moving, switch to a standard length punch.
Support the part with bench blocks, and put it on a SOLID surface.
If the part moves or bounces when struck, again the force is dissipated.
Either put it on a SOLID bench, or just put it on a concrete floor.
Have a buddy help hold it firmly in place.
As above apply some Kroil and give it overnight to fully penetrate.
Use the correct type of punch. For roll pins (these are actually tension pins) use a "roll pin" punch from Brownell's. Again buy a starter punch type to get the pins moving and a longer one to fully remove.
If you suspect the pins have been distorted, and these almost surely were, buy new pins.
Use an appropriate size hammer. Too small may not have enough inertia to do the job, but that doesn't mean using a nine pound sledge.
When working with pins don't just wail away and pound on it. In most cases that will distort the pin and cause it to lock in place even tighter.
If these are simply too distorted to remove, then you can drill them out, but again, that's a job that requires a lot of care and your full attention to prevent damaging the lower receiver.