This is one of those "great debates" that, in the grand scheme of things, means absolutely flippin' nothing at all.
The bottom line is simply that, at the moment of your death, you are either right with God or you aren't and, at that point, nothing else matters - especially the specific time along this temporal existence when your soul was technically saved.
Frederick Danker used to say that "the worst thing to ever happen to the Bible is Bible scholars." And I wholeheartedly agree. And, for the record, I can read Koine Greek.
This is simply one of those issues where people are always going to see what they want to see. Verses that in some way might agree or are at best ambiguous appear to your eyes to be incontrovertible proof and any and all verses that might disagree are easily explained away.
You can show examples in scripture of those who were added to the number or to the kingdom who were then later instructed that they needed to repent lest they perish, which would seem to any on the opposing side of Calvin's theory of Perseverance to fly directly in the face of such belief. To those devout in their belief in Calvin's theory of Perseverance, however, this simply means that either those who were counted as having been added were done so in error, assumingly human, or else that the writer was speaking to a group, some of which were added and some of which were not and only the nots were in need of repentance.
Personally, I find Calvin's entire TULIP to be nothing more than a gross misunderstanding predicated upon massive over-complication compounded by poor texts. When it takes you over twice as many words in English as are in the entire Bible to explain your beliefs about three specific topics - all of which are apparently explained to God's satisfaction within the Bible - then it's obvious that you are massively over-complicating the topics and are almost certainly grasping at straws.
Salvation is so simple you need help to misunderstand it.
1. Hear the Word.
2. Believe the Word.
3. Obey the Word.
If you want to be granted the gift of Salvation, it's that simple. It's a gift, which means it can't be earned. It's a conditional gift, though, requiring obedience. Obedience requires action on your part. So, while you have to "work" for it, it's not of works and you can never earn it. That, in fact, is the beauty of it. You have to strive to earn it, knowing you will fail. That's the result of our human condition - of being sinners. In the end, though, it doesn't matter that we are always going to fail because the blood of Christ hides our failure from God's eyes and makes us appear Holy to Him - the blood that Christ gifts to those who follow Him.
Seek, believe, obey, follow - there's a reason those words are all "action" words and why they're usually in a continuous tense when used in scripture.
In my opinion, there's really no such thing as "getting saved" as Salvation is not an event but rather a condition or a state of being.