Go nuts. Rethink everything a million times. Sleep on it. Think about it in the light of past life altering decissions. Do it. If you regret it try cycling back if you can, retrace your steps. Go nuts, overthink it get a better and better model of how the world works. E.g after renting three apartments you will know more about the intricacies of the housing market this may or may not help you when renting a fourth apartment, after living in three countries you will know more about geopolitics and cultural diversity, this may or may not increase your happiness. Ultimately there are a lot of tiny and big life decission that will have a huge impact on your life quality, with most of them there is no real way of knowing beforehand how they will impact your life quality short-term and long-term. You just gotta wing it, that's life ...