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Get some string and a couple nails. Taking some measurements from an exterior wall is usually your best bet. What’s the longest exterior wall you can reference? Come out 6” or 6’, doesn’t matter, from each end of your longest walk and place your string line. Now you can check measurements with the rest of your layout and make adjustments as needed. Once you’re happy with how things are you can even fasten some scab boards to the subfloor to start your installation off of if you don’t want to just wing it. This way you know you have a straight line that you can firmly bump off of. Otherwise you can rack up a few rows and fasten scrap pieces to it and go from there.