How hard is it to replace the Tranmission Pan gaskets?

Mine is leaking. Went though 5.9qt's of Fuild in 2 days.

I ordered the gaskets from this site. Just wondering how hard it will be and how long it will take.

Thanks,
Jeff

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190D 1985 254,703 Miles as of 3/25/2007
Bought her on 10/4/2006 with 241,132 miles