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If you can, it’s better to use a press to install the pins instead of pounding them in. There’s more control this way and less chance of damaging a piston in case of a miss. I use wood blocks for support which are cut to fit the piston and are then lined with felt to avoid scratching them.
It’s also a good idea to measure the pistons with a micrometer before and after installing the pins to check for any distortion caused by the installation process. I’ve seen pistons turn egg shape before caused by a tight fitting pin and then the pin has to be pressed the opposite way a bit to get the piston back to its original shape. This is why one boss on the piston is marked L or Loose so you know which side to remove or install the pin from.