Tuning a bow is easy Baldie..........But only if you know how Bows and arrows arent always compatible,the most basic component,the arrow shaft comes in an array of materials,lengths,straightness,weight,and diameter tolerances bewildering to the newbie,and thats before its fletched and tipped with a head of some sort.
My advice would always be join a club,theres loads around,and practice with a compound,recurve,takedown,or longbow.See if you enjoy the sport,its not everyones cuppa,before splashing the cash on the bow of your choice.Most club archery enthusiasts will help a neophyte paper-tune