Avoid the increased gold cost when you enchant gear multiple times.
Pretty simple:
1: Select the item you want to enchant
2: Select the stat you want to reroll
3: Reroll it
4: If you don't get the desired stat, simply don't select any of the new stats
5: Hit the menu button at the bottom right hand corner and leave game
6: start new game
7: Rinse, Repeat!