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@reluctant_roady
You'll probably want to get a bike shop to fit the headset cups, although it's also possible if you have a wide enough vice (or wooden boards and a mallet) and are careful. The bearing race which sits on the top of the forks you could also fit yourself, but you need a section of pipe or a collar of the right size to push the race down onto the fork steering tube.
As the fit of the cups on frame and forks is by interference (basicaly they are squeezed on) it's a bit of a brute force job, but one that you do need to be careful over to avoid damaging the running surface of the bearings.
Whatever you do, don't use a metal hammer on the elements of the headset. If you have no other tools you can place a piece of wood in between the hammer and headset. If you aren't confident then I'd strongly recommend you get it done by a bike shop.