Without going into the details of "how" to draw it, your question is how to "practice" it.

So, when I want confidance over a shot, it's best to practice confidance. Having the knowlege of the shot is one thing, but knowing that that knowlege is second nature, and the shot at hand is going to be executed with confidance is another.

Start on the range after simple warm ups. Get 10 of the best balls and set them aside.

Go through your normal setup routine. Pick the targets, imagine the shape of the fairway for the hole you are playing. Place yourself on the tee box and take your normal practice swings with this "draw" swing over and over in your head, practicing that swing path, the positions you want to be in.

Then make the swing.

Evaluate it, and give yourself:
1 point for being perfect,
2 points for a good shape, but missed fairway,
3 points for a bad shape alltogether.

Go through this with the remaining 9 and come up with a score. Next session know what you had last time and beat it. When you get to 10 after 10 shots...I will bet you will be pretty confidant over that shot on the real hole.

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I'm a golfaholic, no question about that. Counseling wouldn't help me. They'd have to put me in prison, and then I'd talk the warden into building a hole or two and teach him how to play. ~Lee Trevino