How do I stop feeling lost behind walls I can't see?

You stand in a half-finished house, and the walls are full of pipe you didn't run and can't see. Your crew, your lead, the guy who's been at this twenty years — they seem to carry a map in their heads that you don't have. That gap feels like proof you don't belong here. It isn't proof of anything except that you are new. No one was born knowing where the vent stack ties in. They learned it pipe by pipe, callback by callback, mistake by mistake — usually standing next to someone who'd made the same mistake first. That is what a crew is for. Use them instead of hiding from them. What's in your power today is not the whole system behind every wall in the house. It's the question you ask before you solder, the note you write after the walk-through, the one thing you learn this shift that you didn't know this morning. Build the map in pieces, out loud, with the people working beside you.