Gasket: Manifold to pipe to cat.

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I thought there was a leak along the pipes, or at the welds and found that really, it's coming from the front---most likely problem is the gasket between the manifold and the front exhaust system.

Has anyone had to do a replacement of that gasket? I read that you have to disconnect the pipe from the manifold and then sometimes break the gasket and "press" the new gasket in. Now when they say press do they mean remove the whole front exhaust assembly and use a press?

I'm thinking replace the front exhaust assembly, and the gaskets at the same time. Probably a few months down the road. Does anyone figure that leaving it the way it is, will cause more problems to other parts---upstream?