I use throttle hold for intentional auto practice and before I start or activate any heli to hold the throttle. I have also programed in an auto pitch curve that best suites whatever heli I am flying. Some people will set a curve such as -7- +5- +12. Some will use all they can get on the bottom and top. Example: -12 -+5- +12 if your heli will do it. I set mine at -10 -+4- +12. Get in a habit of using throttle hold to limit run away motors at start or when you plug the power in on an electric machine. You never know when you have bumped the stick a little. To practice an auto start with the heli about 5 feet high and hit Hold and get use to floating it down with pitch management and try it higher as you get your stck fingers. The object is to keep the rotor spinning all the way down. If you are 100ft high you will probably use all the neg pitch you can to spin the blades and then flare your pitch at about 10-20 ft high for a soft touch down. Autos are fun and as you get good at it you will do inverted auto's and all kinds of variations. Yes the Trex450 will auto.

Jim