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Ok, starting from the bottum of the sink, the tailpiece goes down into the J trap and is connected there with a compression fitting, meaning there's a nut and a plastic washer to take up the space and prevent leaks. The J trap hooks to the waste pipe and the waste pipe goes inside the pipe sticking out of the wall. All connections should have some sort of a plastic or brass compression fitting that squeeze the plastic washer around/into to leaks.
If there is some sort of brazing required then yes I advise calling a plumber.
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