Setting up a BJ car is pretty easy.
First deal with castor. This is done with the aluminum wedges under the lower tube. Go with at least one, two if the rear is at stock height and the front is dumped.
Next is camber. The camber adjustment VW prescribed is slightly positive. IMO this is just stupid. Not only does in reduce grip, it increases wear on the outsides of the tread. I say you want the max neg camber you can get. Do this by rotating the upper eccentric all the way inwards. Consider getting the extra eccentric adjusters Airspeed sells for more neg camber.
Before you tackle the toe-in, you need to ensure the steering wheel is perfectly centered. There is a tiny collar on the steering shaft of the steering box right at the hole in the box. This collar has a small gap in it. That gap indicates the center of the steering box. Test this by counting turns, then position the steering wheel on the column.
Finally, adjust the length of each tie rod to get each wheel pointing straight. To finish the alignment, you need to make some kind of track gauge. I made a telescopic gauge out of the trim strips from a Beetle door. I placed them face to face and wrapped a sleeve around them. I touch them on the inside of the rim behind the axle and ahead of the axle then compare the length. Use a piece of tape to indicate the length. You will have to drive the car up on blocks or ramps to get underneath. I go for around 2-3mm.
Once you have the toe set, take the car around the block to see how straight the steering wheel is. Usually it will be a bit off, so you will have to shorten one tie rod and lengthen the other to get the wheel straight. Do not re-position the wheel. Repeat it as many times as necessary to get the wheel straight.
If the beam is not in the car yet, locate a dead rotten beam and cut the steering stop bracket off. Then weld it onto the narrowed beam. For some reason the manufacturers of narrowed beams don't put it back on. Lazy I guess. After you align the beam, adjust the steering stops such that there's no rubbing anywhere.
If you are very careful with your measuring of the toe, there's no need to take it to an alignment shop.