You can also take a few "practice shots." It sounds crass, but find some women whom you find interesting but aren't outright crushing on. Strangers are good for this. And just practice asking them out on dates.
You can also practice roleplaying with a close friend or your wife. The more times you say the words out loud, the less awkward it becomes.
Gralson: my husband (works out of town).
Auto: my girlfriend (lives with her husband Zoffee).
The most dangerous phrase in the English language is "we've always done it this way."