I can tell you a few tips that have helped me be what I consider successful. However, I do still consider myself a newbie without a bag full of trophies, but I have found some tactics that work better than others. I started hunting the woods of St Helena seriously about 4 years ago and have learned so do's and don'ts of that area.
#1 I personally do not use crow calls or hoots to locate a turkey on the roost, and have been more successful by doing no locator calling. Instead, I have been trying very soft and subtle tree yelps right before sunrise. Normally with a glass or slate pot call that I find best to control volume.
#2 locating in the middle of the day or evening, I have had best success with a wingbone and a box call.
#3 Practicing the less is more tactic when calling, call less, and again, not as loud. If the turkey responds and is moving closer, I stop yelping altogether and go to a put or purr if any at all.
#4 Some of the products I have found to be better than others, Primos Jackpot Glass or Slate, Woodhaven Cherry Box, Preston Pittman Diaphram (blue saphire), Talkin the talk glass pot, also like the mouth calls too (swamp ghost) is my favorite.
A combination of above has had me in shooting shooting distance of a mature turkey for the last 2 years, for one reason or another I was not able to seal the deal but I have high hopes of meeting up with him again this year. Hopefully luck will be on my side and I can close the final chapter on that turkey.
What kinda go to products or tips do you have up your sleeve?