http://www.morphworld30.com/tutor.html

 Some good tutorials here.

Magnets are really worth learning, they are really powerful once you understand them.

If you are converting clothing you can also take small steps, like amacord said, do a little at a time and it will go much easier. Don't forget you can change the look of the Mag zone under element display to a 3d circle to see exactly what the zone is affecting. The zone center is powerful then it falls off as it gets farther.

Try this, select the chest, and create magnet, then scale the mag base up a little bit. Move the Mag zone and base over to one side of the cloth and z scale the Mag to flatten it.