Tuning Regulator setting for hatsan flashpup needed

Have a Hatsun 25 caliber flashpup in wood. It's a 2021 with aluminum tank. Ordered a altaros regulator for it. Won't be here for a while. Just wondering from you guys who have installed it. Is it a pretty straight forward install? Where to start with regulator setting for best accuracy with 25 grain pellets? Accuracy is foremost then power. I have a chronograph as I reload for powder burners and am very comfortable with this. Any advice welcome.