There are some techniques that are a good guide for most people, but after that as Zaks says, it becomes what is right for the individual, and shooting that particular rifle. The manner of the trigger release is all-important, you have to be able to know precisely when it will let off and any doubt about that makes things much harder.
Like Zacs, I've come to learn that I can do pretty well with a breathing technique that defies some of the ground rules. I shoot with my chest empty, not full, not breathing out. It used to be the case that trainers insisted you count to four, and if the shot hasn't gone, do another cycle. I can press that four to ten or fifteen, easily now, after years of practice, but I wouldn't teach that to a newcomer.
As a hunter, you may well find yourself adopting a sporter or shotgun stance for standing shots. Unless you have massive upper body strength, that is not a good plan. Just look at the stance of the 10m shooters especially the ladies, where you use bones and your skeleton to take the weight, the only muscle in use is the one that lets the trigger go.
I would get myself down to a decent club and ask a good instructor to spend time with you, then you have to put the time in for yourself.
Here's a practice card of mine from Friday, fifteen shots 22 cal at 20 yards standing. Normally I only shoot 5 or 10 in a card but this one went well so I carried on.