It involves a lot of hard thinking about what exactly your priorities are and a lot of decision making -I'm sure we all know how tiring that can be!
You have to accept that, to coin a phrase, you can't have it all.
Not if you want to live more simply.
You can't do it all either, and you can't be it all. But knowing this is so can be a bit of a relief... You have to choose and try to make good choices.
I've done it slowly, mindfully, over four years.
Has it been worth it? Absolutely
Leo Babauta at Zen Habits says it is painful. See here. Would you agree?