Define the point where you can take a breather. Map the route between this here now and that there then.
If you can count the steps along the way with confidence, that's good. If you know how you might change direction midway through or even turn back, that's good. If you can decide in advance what cues should compel a change of course, that's good. And if you really believe you'll take that breather when you get to the first predefined goal, that's even better.
But maybe -- like Zeno's paradox of Achilles racing against the tortoise -- you'll never allow yourself to catch up. No matter how long it takes you to reach where the tortoise was, by the time you're there the tortoise will have moved farther on!
Ask people who understand you and your project (and who won't flatter you!!!) what they think.