To be completely enlightened means that you're a Buddha.I don't speak of enlightenment.
As my lama always told me, I learned that I practice better when I'm by myself.
Basically, I feel to spend the rest of my life doing retreat.
Even if one isn't a committed Buddhist, it just helps us become better human beings.
People should find what approach really speaks to them, and then do it. Obviously, better with a good teacher, who can help you on the path. But in any case, basic principles.
If you just follow your inner calling, then you just go ahead.