I didn't find those sins hard to resist. I thought they were wonderful. I loved them. I had no sorrow for indulging in them.
Character change is the result of being saved from sin. What is character? It is who we are at our core. What we believe in, what we do when the chips are down, what we do when no one is looking. That's what we will take to heaven. There's no other part of us that is worth keeping. It's the guarantee that sin will never rise again. That's why submitting to God and obeying Him is so important. It's the tool God uses to change our characters, and character change never happens all at once. Character is built one day, one moment, at a time, It's the result of our choices. That's why sanctification is, as Ellen White says, the work of a lifetime. It's also why sin is never overcome in a moment.
So, the arguments about Christ only saving us from the results_of/condemnation_of sin fall flat because the very tools He uses to remove sin from us, or in other words, perfect us, require time. That doesn't mean His tools that remove sin from us are weak. It means they work hand-in-hand with human nature, not outside of human nature.
This is why Ellen White says all we really have is the power of choice. The rest of it is God's work for only He knows each one of us how to go about removing sin from us. I couldn't even begin to say how to do that about myself, let alone some one else. Where would I start? Where would I end? It's all about trusting God to keep His promises because then we will go and do what God asks of us, and the result of that is God sanctifying us. That's why sanctification is by faith, just as much as justification is.