2000 Isuzu Trooper

Engine problem
2000 Isuzu Trooper 6 cyl Two Wheel Drive Automatic 72,000 miles

I recently had a diagnostic run on my 2000 isuzu trooper after the acceleration started causing some rumbling. The results came back that the ignition coil on cylinder 4 is bad and it needed some new spark plugs. After they attempted to charge me nearly 800 to fix it all I decided to see if I could do it myself. If I order the new coil what steps should I take to begin or is it something that is extremely difficult on this model car? Thanks.
January 3, 2008.

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