Roughing it in

How often do we not start or abandon a project/idea/path because we can't do the whole thing perfectly or include absolutely everything we want? What would happen if we embarked on the journey or kept going through the valley of despair by thinking about what we could rough in? What could we leave space to add later when we had the time, resources, etc.? You might figure out that thing might not even be necessary in the first place and as a worst case the overall doesn't stop or get stuck  just because of a part or two.