The Hornady manual is a poor start for a newbie. I`d pick up a Lyman manual or Speer. Both are much better at discribing the steps we take loading ammo. The Lyman is IMO the better of the manuals out there today just because of this.
The sizeing die needs to screwed down with the ram at the top of its stroke. When the die touches the shell holder lock it in place and size a cartridge, be sure to lube your brass before doing this.
Try to chamber your sized case in your rifle. If it chambers easily you`re fine, if you feel resistance to closing the bolt, screw the die about 1/16-1/8 deeper USEING A NEW UNSIZED CASE once more size and recheck for chambering. If you need to go more the 1/4 turn deeper I`d take a look as some other problem may be present. A old sized case will not spring back like a unsized one and your adjustment may not be correct, use an unsized case to check all sizeing adjustments.
To adjust your bullet seating depth, you will need to put a case in your shellholder with the ram moved to the top of its stroke screw in the die WITH OUT THE SEATING STEM IN IT until it contacts the case. Back it out a turn and lock it. YOU DON`T at this point want die contact with the brass.
Lower the ram and start a bullet in the case mouth. The neck may be too tight to get a bullet in it but at least have the bullet as straight as possible in the mouth and with the ram still at the top of its stroke screw in the seating stem until contact is made. Lower the ram and a little at a time screw in the seater and seat the bullet. Measure the OAL and continue setting the seater deeper until it seats the bullet to your desired depth (OAL).
Once you have the bullet seated to the desired depth, color the bullet ogive (curved part of the nose) with a magic marker and chamber it in a safe place. Extract the bullet carefully and check for contact with the rifleing. If present, it will show itself as marks in the ink. If you are contacting the rifleing seat the bullet another 1/8 turn deeper and recheck until no contact is present.
Lock the die ring and enjoy your new hobby!!