Terry's method relies on a reasonable alignment before replacing the track rods. Once you lose the camber setting, both it and toe need to be done from scratch. This rough and ready method is well worth doing before a proper alignment.
I've done several this way, and they drove OK. But the improvement after an intelligent session is massive and well worth the £100 it might cost. The place I use adjust front toe in the cost of putting it on the machine, further adjustments are priced separately. Last time was £45 for the setup, and another £24 to adjust the rear, which included freeing the adjusters. If the camber is right and the front toe close, it won't take someone who knows what he's doing very long to get it right.
20minutes too much camber will reduce tyre life to about a quarter of what it could be: 6000 miles instead of 24,000 in my case. Incorrect toe will kill tyres too, but it will be horrible to drive as it happens. How can you afford NOT to do it right?
It's also the main reason we suggest that the entire front suspension is serviced at the same time; wishbones, trackrods, shocks, top mounts and bearings, and springs. They'll be overdue on any used Omega, and won't need doing again. But it's going to cost as much in parts as you can pay for a viable car.