I say bit-by-bit.
The second time around, it's not like you're trying to determine the set-up for everything. Drop axles/install axles. Perhaps it's not spot-on, but you're not out of the ball park.
While you're at it, re-pack the joints, check other previously installed components for proper fastener torque, possible interference/clearance issues that may have exposed themselves, etc.
And what if the new axles don't show when expected? Do you really want a few thousand dollars in parts laying around collecting dust for another few months before you get to enjoy them?