Haynes manual is a good idea.
Can be done in a day. Warranty on the used engine is recommended.
Can be a weekend job but be prepared for your patience to be tested as the first time everything doesn't usually go right.
These 2.4L engines go bad all the time, so if I were you I'd buy something else.... maybe an Alero with a 2.2L - but make sure the timing gets changed at 100k miles or it will have issues too. Much better engine though.
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