OP,I hope you are not thoroughly confused by now.There is more than one way to skin a cat.
IMO,you cannot go wrong listening to kraigwy.
There are ways to study the downrange trajectory of your rifle and cartridge.You can then use that data to maximize the range that you can confidently hold dead on and shoot your deer or whatever,assuming your trajectory will stay within an acceptable high or low zone .This may be called a "Max Point Blank Range".
At this point,don't worry about it.I do suggest you begin by putting your group center about 2 inches high at 100 yds for a 30-06 class cartridge.That will put you near dead on at 200 yds,and about 8 or 9 in low at 300 yds.
At this point,that is probably enough to think about.
With a scope,I like the orange sight in targets with the grid.You can see crosshairs well against the orange.
On boresighting devices..one piece of advice...Don't let anyone use the kind where they push a spud into the muzzle of your rifle.
I bought one of those,an old Redfield.The spuds MAY be too tight,and are subject to damaging the bore at the muzzle.
I do not use one.At home,I can first REMOVE the BOLT from an unloaded rifle.A rifle with no bolt in it is quite safe.
In this condition,you can set up on sandbags on a table inside your house looking out a window at some distant point.Please use discretion to not alarm anyone and get arrested.And,when you re-intall the bolt,go back to treating your firearm as if it is loaded.
Carefully look through the bore,then the scope.Get the scope and the bore pointed at the same point.It helps to have one person looking while the other adjusts.
If you do this ahead of time,it will avoid wasting range time,and you can relax.
The 25 yd verification is good if the range allows a 25 yd target.
Realize the adjustments are(probably) in terms of Minute of Angle,or some fraction of a MOA.like 1/2 or 1/4 MOA.Know that value before you go to the range.
A MOA is very close to 1 inch at 100 yds.Or 1/4 inch at 25 yds.Or 2 in at 200 yds.
Adjust accordingly.
Wear ear protection.
This next part is important.Be aware that if your eye is too close to the scope when you shoot,or your position is bad,the scope will recoil into your eyebrow and cut you.
Don't let that happen.
Recoil on a bench can be very punishing.That will lead to poor shooting.
Cheat. If you can find one,aPAST brand recoils shield works well.Or sew a cutoff pant leg into a sandbag for your shoulder..Maybe scrounge something.
Painful is not fun.
Focus totally on seeing the crosshairs on the target as the rifle recoils.Knowwhat that image looked like.Be able to point at a target and say "here" .This is one way to know your eyes were open at the shot.You really need your eyes open.That focus will help.
I make my initial adjustments based on two round "groups".If I can get two rounds to go pretty much to the same spot,I will twist knobs.It saves ammo,and you will only absorb so many rounds of 30-06 recoil before your shooting suffers.
If I get a good three round group for my final adjustment on the bench,and it is where I want it,say 2 in high at 100,I call it good....to a point.
You do not have that bench hunting.
Now practice and verify off the bench.
How will you shoot in the field? Sitting? Prone? Over a backpack?
Do you have access to 200 yds? 300? How well can you nail an 8 in paper plate?Out to what range?
You will both verify your sights,and,more important,know your own limits,and be confident in what you and your rifle can do.
Then go get a clean,quick,one shot kill.