One popular method is to use a tool called a “trigger jig” which holds the trigger in place while you tighten or loosen the screws.
Another method is to use a screwdriver and adjust the screws by feel.
Some people also recommend using Loctite on the screws to help keep them in place.
It’s important to be very careful when adjusting the triggers on firearms, as it can be easy to make them too tight or too loose and render them unsafe.
It’s always best to consult with a gunsmith if you’re not comfortable making these adjustments yourself.