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The job is as you have described.
When you remove the brake callipers sit them up on top of the axle housing, don't let them hang down on the hoses.
You will need a hook type seal puller to get the old seal out. I find the best way to get the new seal in is to use a socket the same diameter with a 6" extension and tap it in with a hammer.
Clean the axle and try to hold the axle in the centre of the seal when you reinstall the axle,ie don't just let the axle slide in on the bottom of the seal.