Is this something a newbie can change out?
or will it require drilling &/or special tools?
Minor mechanical skills
Hammer
Punch to remove/install front sight pin and a larger brass punch to remove/install rear sight. probably won't need punch for install of new rear sight.
Round and/or tapper file for new front sight, needs to be notched for front sight pin to be reinstalled. Use original front sight as pattern for notch on new front sight.