Yes - that's archery!
Look at it this way - if it was simple you'd soon get bored!
Getting your bow set up correctly is essential. However, tuning it from there on is not quite so easy - you can only tune the bow as accurately as you can shoot. (If you could shoot an arrow into the same hole in the boss time after time after time, that would be perfect; then the bow could be tuned perfectly
to you as well). As it is, you will get a basic tune which will allow you to shoot as well as you can at present; as your form improves over time, so the bow's tune will need refining also.
So don't be fed up - there's lots of fun ahead. And it's
very addictive!