Take 2 long somewhat flat, sturdy pieces of material like square tubing or rebar.. something long enough that it will be at least 5 or 6 inches longer than your tire is tall..
Next take a bungee cord and strap said flat material (ill refer to them as bars) to your tire, so its parallel to the ground and runs through the center line of the axle, do this on both sides
With your tires straight, take a measurement from the rear between the bars, make sure to take the measurements from equal distances from the tire as close to it as you can, and pick either from the insides of the bars or outsides.. whatever you pick be consistent. Write down the distance.
Take the measurement from the front of the tires the same as the rear, take the measurement from the same side of the bars as you did for the rear. Write this distance down.
Your front measurement should be 1/16th to 1/8th of an inch shorter than the rear. If not make the appropriate adjustments in the tie rod end links until you've reached the correct measurement.
Once this has been set take it for a short drive, check the steering wheel alignment when driving on a flat straightaway. When you get back home make the necessary adjustments in the drag link ends until your wheel is straight again.
Might help to have a friend with you to give a hand.