a couple years ago i bought this little goodie and it's paid for itself in spades.
Longacre Toe Plates
it's not hard to adjust it if you can read a tape measure and have good vision to sightline the front vs rear wheels.
for camber adjustments, i try to set at zero for the same reason - flat contact patch on a straight line. to do this, i use a carpenter's level against the side of the tire.