Here's what I know...
Right before dusk, you can use an owl call as a locator call to get the gobbler to talk back. If you are familiar enough with the land, you should be able to figure out where he is roosted. Don't go track him down, stay a couple hundred yards away and out of site. Don't be slamming car doors, etc.
The morning hunt:
The next morning, you want to try and get within about 75 yards of his tree. EARLY! By that, robins usually start chirping 30 minutes before sunrise. You want to be sitting in your spot about 30 minutes prior to that. Stay still and stay quiet. Get your gun and everything ready because once it gets light, he may be able to see you.
As for calling:
Don't call until you hear him gobble. Once you hear him, you'll be able to be comfortable that he's where you expected him to be. At that point you should make a soft tree yelp just loud enough to let him know that a hen is close by. Many guys want to hear that gobble - rest assured, he's right where you wanted him, so stay quiet. It may sound like he's moving closer/further away as he shifts around on the limb, so don't get nervous and start calling him in. If you call to him too much, he will stay roosted longer because he expects hens to come to his tree. So maybe one soft yelp every 10 minutes after you hear him. You need to stay still too - hens may be headed for his tree. you don't want to be picked off.
If you are within 75 yards, you will SHOULD hear him fly down (assuming it's not a windy day, etc.). At that point he may have flown down on your side of the tree (that's optimal). Once he hits the ground, you can give him a fly down cackle. At that point, he should be hitting your calls back and you can start to call him in. If you're hunting with a partner, they should setup 25 yards behind you. You won't have to call at all and he should walk right up to you.
My only other tip (for easterns) is that a boss hen will yelp in a pattern of 5 when she is assembling the group (yelp-yelp-yelp-yelp-yelp). You can do the same and get the hens to come to you. So if he gets henned up you can mix in some purs and the 5-yelp and maybe bring the whole group to you.