I dont really worry about it. About 5 billion people are currently on a course toward hell if they dont repent, and its not something that one person can change for all of them. I have my own small sphere of influence, and that's what my life is about. But really, fear isnt of God to begin with. Jesus said Love was the most important command, and imo, striving isnt found in love for the most part. Striving and constantly concerning ourselves with whether people are saved or not, and how close they are, is often rooted in fear- "Oh no, that person is going to hell. What I am going to do?! What I am going to do?! What if they die tomorrow?!" <-- All that is fear. The devil whispers those thoughts in our ears for us to focus our witnessing out of fear and so we try to push people into salvation, instead of simply inviting them to it and having them see that it's worth it. Almost any time people are continually pushed on an issue, they won't want to do it out of their own desires, because they feel pressured from the person pushing them. It's like getting wild animals in a corner, we all need breathing room to think things through on our own. I tend to try to simply have good relationships with people, and really get to know them. Just being nice can make a world of difference to people, and even showing that christians arent perfect helps, because then they dont think that this "religion" is some incredible set of standards that they think they have to live up to. People have enough junk in their lives, they aren't going to want to add more stress from extra rules that they have to worry about.
Anyways, I think eternity is a bit much for a punishment when just as much of the fault for the person going there falls upon the other people that helped raise and influence that person (including us). I mean, i think a lot of people would be heading toward heaven right now if the people around them were godly people, but as it is, they may not make it. But anyway, I didn't make the system, and God knew what was fair and what wasn't. He is perfect love, so I bet there are some things we don't understand that make it more bearable (the reason for the person going there, not necessarily what happens there). But yea, it's not a focus of mine at all really. I think there is a lot more, if not 90% more, of people that will be won with a love focus and building relationships than with a "your going to hell if you don't repent" focus. And if that many more people will be brought to their senses with a focus on love, then it isn't worth spending any excess time thinking about hell.