The only real trick is to make sure the cutting die is adjusted correctly.
You want to start out with shallower depth threads until you get it threaded, then cut to full depth.
The trick is you don't want the starting threads to be too shallow or too deep.
You want to have the TAT screwed into the die only a couple of turns to give yourself plenty of range when threading.
If the TAT is in too far, you'll only be able to get a couple of threads cut, and it's too easy to get things cross threaded if you have to back the die off to get more room on the TA
Other tricks are:
Hold the rifle with a vise. You can't really control things if you're trying to hold the rifle by hand.
With the barrel in a padded vise, muzzle up, use aluminum foil to form a funnel around the barrel to catch the chips as the die cuts them. Note that the chips are SHARP and will embed in shoes, bare feet and into floors. In your shoes they're ruin a floor when you walk over it.
Put a patch or some paper towel down the barrel a couple of inches to prevent chips from dropping down the bore and into the action.
Push the plug out from the rear so the chips are ejected from the barrel.
Use PLENTY of cutting fluid, NOT common oils.
Lube the TAT device well.
Most important, just PAY ATTENTION. This isn't a hard job, but if you don't attend to the small details you can botch it up.