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@lae
531 main tubes only, if it was 531 throughout it'd say '531 frame tubes, forks and stays' or something similar.
When you knock out the cups, just go round and tap lightly - tappy tappy tappy all the way round and it'll come out straight. The commercial tool is just a flared pipe, so you can some 22mm diameter plumbing pipe, cut a cross into one end perpendicular to the length of the pipe (like you'd cut a cross into the top of a brussels sprout), then peel the ends apart a little - push the narrow end up and pull up into the headtube until the flared end 'pops' up over the inside of the cups - knock it with a hammer and it'll push the cups out straight every time. The professional tool is steel so it lasts a little longer before it gets bent, but a length of pipe is about 3 quid and you can get two tools out of it...
A good vice will install the cups nice and straight, cheaper than the specific tool and it's a useful thing to own anyway - £20 from a car boot sale will get you one. Just don't go mad with it or you'll squish the headtube.
There's really no reason to pay a bike shop to install a threaded headset, especially a steel headset on a steel frame. A little mechanical sympathy will save you a lot of money/time. TBH there's not really anything on an older steel bike that you can't DIY with only a few specialist/home-made tools, even rear spacing and hanger alignment.