Perhaps these points for contemplation will help clear away uncertainties.
If you could live the life you live now, in your community, with your family, the only difference being that everyone everywhere was happy and healthy and doing what turns them on, are you ready for that?
Are you ready to live on an Earth that is likewise healthy and beautiful and clean, all of nature vibrant and pure?
What if you were to wake up tomorrow, or some day a week from now, with no aches or pains, no blemishes, totally fit and strong and rejuvenated? Are you prepared to accept that as your state of being, and the same for those people around you?
What if you realized that you had all the answers to all the questions you always wanted to ask? Are you ready for that level of truth-knowing?
Would you enjoy living on this planet if there were no guilt associated with pleasure?
Are you ready to hear the truth come from your children’s lips? Can you let go of worry and know (beyond belief) that everything — everything — is going to be just fine, that the mechanism of our evolution operates with absolute cosmic perfection? What does letting go of worry look like for you? What beliefs are you looking through but not seeing, that are really not part of that kind of new reality? Are you able to see them and walk away from them, knowing they will crumble without your energetic input?
These are the important points, before worrying about what ETs look like, how they will arrive, what will happen, etc.