rough alignment question

Imagine a hunk of 2 x 4 wood laid flat on the driveway that's just about long enough to go from the outside of each of the front tires.
Get a heavy wire coat hanger and cut it into two pieces about 12" long.
Drill 2 holes slightly smaller than the wire diameter into the wood approx at the centerlines of the tires.
Insert the 2 wires into the holes and trim the lengths so they almost reach the center of the tire when the wood is laid flat on the ground. They do not have to reach all the way to the centers, but closer to spindle centerline is better.
Center the steering wheel.
Slide the wood/wire assembly under the car from the side and adjust the location so the wire tips are against the front of the tire treads or just slightly away.
Bend the wires so they line up with one of the tread grooves near the center of each tread.
Carefully pull the wood out from the side of the car without touching the wires against any of the car structure. Sometimes it's easier to pull it out about 6" and rotate the wood downward so the wires are parallel with the ground.
Insert the wood behind the rear of the tires and rotate it up so the wires are near the tread again.
Adjust side-to-side so they line up with the same tread groove you used at the front.
A good target is to make the front dimension about 1/16-1/8" closer than the rear. This is toe-in.
Make your adjustment by rotating the tie rod sleeve.
Remove the apparatus and roll the car forward and back a few feet and check again.
Make sure to tighten the jam nuts against the tie rod end when done.
If done carefully, this is good enough to get to an alignment shop, or further, if all you replaced was a tierod(s).