When I open Castlevania SOTN

Any assistance is much appreciated.

is it possible to combine xplorer and the game together so I don't have to do a disk swap if that is the case?

I was wondering if there is a guide out there to show us how to actually modify a psx games. For example, in Castlevania SOTN; I would like to know how we can find the real offset of starting hp/mp/hearts, store selling offsets and its price, etc... Once we have the offset; I need to know how we go ...