Here's the method I used when I put on some Baer Tracker bump steer eliminators; it made me feel like a real techie guy and I didn't have to go the alignment shop at all:
1. Rotate steering wheel to full lock, then crank it to the opposite full lock, counting the revolutions. Divide by two and turn the wheel back that many turns, to center it. Put the steering wheel on, centered.
2. With all four wheels on a flat surface (although my garage floor actually is not all that flat), and making sure the fronts aren't jacked up from being lowered off a jack, you take a piece of string and have an assistant hold it against the sidewalls of the rear tire on the driver's side, and then you hold your end against the sidewalls of the front tire. Now adjust the driver's side tie rod to make it all square up. This is not going to work out perfectly if you have bigs-n-littles or the like, but for most cars it will get you into a pretty good ballpark.
3. Using a string or a tape measure, and referencing a tire tread feature at the same point on the front and rear of each front tire, use the passenger side tie rod to bring the passenger side square.
4. Now you have zero toe-in. Now play with the tie rods to get the toe-in you want, adjusting each side equally.
Of course all this takes a bit of trial and error, and it's not as exact as a laser equipment or whatnot in the hands of somebody competent, but as other posts have indicated there's no guarantee you'll find such a somebody. I'd say I've found more good than bad alignment techs over the years, but getting an understanding of how to DIY and putting in some trial and error will get you there too.
