You set your eyes on the goal, get the direction, and get to work. Bit by bit, day by day, you get lost in what you do. Occasionally you look up, and the journey still looks long, the road tiring. Then you look back, and you see the progress you have made since the start. And the further you go, the more the road opens up with multiple paths, some not known at the start.
Before long, longer than you initially thought, but shorter than you envisaged when you looked up, you are there, or halfway past your destination. Just like that, you have arrived. But, hopefully, along the way, you learnt that the journey is more than the destination.