Depends on what you're used to, but if you have to ask, it's probably not going to be easy. If you have no idea what you're getting into, I would recommend a Ford shop manual and it will walk you through the job.
I bought one for my Tempo, and I don't know if I would have ever figured out that I could drop the front of the engine down (after removing all of the front accessories, pulleys, & mount) to get the harmonic balancer out of the passenger side wheel well. Ended up being like an 8hr job LOL. There's always a right way to do things that might not always be obvious.
1987 Ford Ranger Short Bed 5.0L/T-5 Project
1988 Ford Ranger Long Bed Parts Truck
1993 Ford Tempo 2.3L OHV HSC Auto - D/D Stock.
1999 Honda Accord VTEC Auto
2002 Dodge Caravan - 3.3L Auto