If you want to be super precise about things, you can tape a round ball and a half (or their equivalent weight) at the breech and a penny to your front sight location to know your "loaded balance point". But wait until the finish is on your stock, (as well as all the other metal) because that too will add weight and affect the balance point. If you plan on keeping things in the PB, put them in there too. Hold the gun (balanced) in your 1-handed hand, and mark where your hand engages the barrel front and rear. That zone is off limits if you don't want it digging in to your hand (or risk inadvertently moving it) while you carry it 1-handed. Try taping the sights in place just outside of those 2 locations and see if those work for you. If you have a swamped barrel, the further up the barrel you go the higher the rear sight will have to be (or lower the front). That's pretty easy to figure out because you just have to caliper / measure the differential in barrel thickness at those 2 locations.
I built 1 Lehigh (swamped B-weight) with just the standard HC/PC low rear sights installed just behind the rear of my bare balance hand engagement point, and that only let me install a front sight .080" tall, which is WAY too hard for me to find efficiently and quickly. For the second one (swamped A-weight) I raised the rear sight by .100", which let me have a front sight about .18" tall, which is much easier to find. What I actually did to do this was figure out what sort of a minimum front sight height I needed (or MOA to be more precise) in order to find them comfortably visible. From there I determined what rear sight I needed. It's not HC/PC for this particular gun, but one of the deviations I made to make it work for me, and I'm the only customer I had to please anyway. I like front sights that are about 5 1/2 MOA in width, (a standard round bull at standard distance is 8 MOA) and a rear notch around 12 MOA so the further away from your eye you are, the wider / thicker those have to be. We can go in to the math on how to calculate that later if you want.