Jimmy, it's really very simple. On a 50 yard target, make a dot for your point of aim, and use that same dot for your point of aim each time you index the liner to a new position. Then make a registration mark top dead center at the 12 position on the barrel liner, and shoot a 5-shot group at the dot on the cardboard. Then rotate the liner to the 2 o'clock position and shoot a 5-shot group using that same dot for your point of aim, and then rotate the liner to the 4, 6, 8, and 10 o'clock positions and fire five shots at that same dot. You will be surprised to see groups forming on the target all over the place, but steadfastly hold the same point of aim for all groups. You are just looking for the best group and don't care where it forms on the target at this point.
One of those 5 shot groups is going to have every shot in the same hole. This is the point where you will want to set your liner permanently and make a note of where you set it for future reference, so that should you ever remove it you will know where to put it back. Then at that point just re-zero your scope so that your pellets POA = POI and your done. All you're doing is finding out the position in which the liner will put all five shots in the same hole, for absolute best accuracy and from there you can adjust your scope accordingly.
One of those positions may put five shots in a 2-inch group, whereas one of those positions may put all five shots in the same hole! So there you go.