It seems most issues are covered. One way to bore sight is to place your rifle with the bolt removed and look down your barrel to the point at about 25 yards that you see looking down the barrel, then adjust your scope to put the cross hairs on this point. This is the most fundamental procedure of boresighting and does have the virtue of not requiring any special equipment. Perhaps it is not extremely accurate, but bore sighting is not supposed to be extremely accurate, just to be accurate enough to keep you on the paper at 100 yards.

This is a little off topic, but I always put a small dot of red nail polish on the joint between my scope and one of the scope mounts (like when I have a scope mounted on a new rifle). If the scope ever moves in the mount, you'll be able to tell. I took this action after an experience with a scope moving in the mounts.

Sight in with the same ammo you will hunt with. Try shooting different loads in your rifle to find one that shoots better than others -- different loads (different bullet weights, different manufacturers, etc.) will shoot to different aim points and with different accuracies in different rifles.