Hortensia make a great point. It IS a 2 step thing to get over. 1) We WILL die and 2) Theres nothing else.
I've never believed the end would come in my lifetime, so I've always accepted #1. But only recently I've had to face #2. My wife really has a problem with this. She does accept #1. Her father died over 10 years ago, but she's never really mourned him properly, because she's haning onto the hope of #2 and that she'll see him again. Even though he wasn't a witness, and according to the WTS he won't be coming back - she hopes that the GB might have got this one wrong.
I don't know if it's intentional, but these beilefs make us devalue our current lives. They're only a few years full of nothing meaningfull, the good stuff is all to come in the future. So we never get any enjoyment out of life. I'm 37 and freaking out because of all of the time I've wasted in my life. I can't imaging coming to this realization at 60+. The other thing is that we never mourned our lossed loved ones. They're only sleeping. Lucky actually - they don't have to see the great tribulation. Only a few more months and we'll be reunited. I guess mourners aren't good salespeople on the ministry.