I’ve adapted the answer I gave in a
previous thread on this same question. OP, I don’t know if my answer contains any practical advice on how to make it happen, but at least it’s meatier than “just stop”
My wife and I did this successfully. As I was going through RCIA just prior to our engagement, the night where sexuality was the RCIA topic hit us like a ton of bricks. We both realized that night we needed to stop and wait until our wedding night. Once we both firmly resolved that, it actually wasn’t that difficult. Since we both had the same resolve, we backed each other up. I remember some evenings where one of us wanted to give up on it the other stood up and laid down the law. Fortunately, we were not living together, which would complicate matters.
I found that reading Christopher West’s books explaining Theology of the Body helped me immensely in coming to an intellectual understanding of why it is a necessity.
There’s also some practical reasons that, in hindsight, were valuable payoffs:
1: There’s a reason 50% of marriages end in divorce and something like 50% of spouses cheat and it has a lot to do with pre-marital sex. If you abstain until marriage, you are basically closing all those doors for your marriage. You are putting your marriage on an absolute rock foundation. My wife and I abstained for 2 years up until our wedding night (this was after 5 years of being sexually active) and we both now realize that has a lot to do with our rock solid marriage. It is wonderful to never, ever have to worry about your spouse cheating on you and we don’t because of what we went through together.
2: Sex clouds our judgment. Many, many people (me included) have stayed in a bad relationship way too long because the sex hinders our ability to see things clearly and make an accurate appraisal of the suitability of our mate. By abstaining, you give yourself the ability to be 100% certain you are marrying the right person.
Anyway, that was my experience with it. Best decision we ever made!