Yes, one should set specific goals and hopefully not all in dollar value terms. Most of all, this is a reminder not to be frustrated during the process of achieving said goals and not making our happiness depend on whether we reach them or not.
If we don't enjoy the process, do we really have any guarantees we'll be happy once we've reached a specific goal?
Or will we say to ourselves we're setting a new goal and we'll be happy once we reach that new goal?