Yes, it is true. The half pass is a very advanced movement in dressage, it requires a lot of strength and balance on the horse's part, and very tactful, balanced riding on the riders part.
You must work systematically when training dressage, each step and movement, is a stepping stone to the next.
Before half pass, you need to have good control of your horse's shoulders and quarters.
Half pass, is essentially travers on the diagonal line, but without a good understanding of shoulder in, often you will get a crooked half pass, or an incorrect leg yield.
The shoulder in involves having the horse bend around the inside leg, and working on 3 tracks. The outside hind moves on it's own track, the outside fore and inside hind together, and inside fore on its own track. The quarters track straight, while the shoulders move to the inside. You won't get a good shoulder in, until the quality of the pace is very good, with the horse engaged and lowering behind. If the horse is working on it's shoulders, it is physically impossible to perform a lateral movement with any idea of correctness.
It sounds like you're just starting out - find yourself a dressage coach for starters. I'd say, from reading other posts, that what you need to be thinking about right now is improving the quality of paces and reactions of ads, rather than 'tricks'.