Welcome to JWN thedog1!
You said: "I don't know how I could explain it to others, and when I have to conduct he upcoming study clarifying the 'this generation' teaching, again, what will I do?"
Here's a couple of options for conducting the WT study:
1. Call in sick. If the content of what is in the upcoming WT is so repulsive to you that you can't bear to conduct it, don't. You can only use this card selectively in the months ahead though.
2. If you can stomach going through with the conducting, just conduct the WT study in a fairly lackluster manner. If you're following the Branch guidelines for WT conductors, you're not supposed to be saying very much anyway. Just let your local fellow elders do the unpleasant task of parroting the latest "new light".
As far as explaining it to fellow JWs in a one-on-one setting, how does this sound?
Over the last several decades the maximum length of "this generation" has gradually increased. "Generation", as defined by the F&D Slave was at one time a little less than a human life span. (At least some Armageddon survivors had to be alive and old enough in 1914 to understand the import of world events.) Then it grew a bit longer to an entire human life span. (Some Armageddon survivors just had to be ALIVE in 1914. ) With this latest understanding from the F&D Slave (make sure to throw in lots of F&DS references) "generation" now has grown to longer than a single, very-long, human lifespan. It's one of those deeper Bible truths so I don't think I would recommend trying to explain it to a brand new Return Visit unless they brought it up.
Best of luck on the road ahead.
om