Replacing a clutch is not too tough. From my experience here are some tips:
1) Get a manual. A Haynes manual will probably give you all the basic pointers you will need.
2) Buy a HF transmission jack.
3) Get the truck as high on jack stands as you safely can. The only time I have been envious of Whitney is when replacing the Camaro's transmission/clutches and I needed a lift
4) Before you start, locate all the bellhousing bolts and make sure you can easily access them. Likewise, if the starter has to be removed locate those bolts. Purchase any extensions for your breaker bar, torque wrench and socket beforehand.
5) PB Blast all bolts the night before. This is just a safety thing. You do not want any of those bolts snapping. That being the case, put the air gun down and step away from it. Shoot, have your wife or best friend lock in a gun safe.
6) Support the motor before removing the transmission. Support the transmission on the HF jack. Strap that bad boy down. Slide it straight out of the away. Do not lower the stand or loosen the straps. This way it should slide right back on.
7) Take care as not damage any cables or plugs (speedo, reverse, etc). Take extra special care.

Have the flywheel resurfaced. Better yet, just get a new one and be done with it.
9) If you have a hydraulic clutch, plan on replacing the slave cylinder. Hey you got it all apart. Plan on swearing a lot when bleeding the slave cylinder. Never push the clutch pedal in with the slave cylinder not connected...don't ask.
10) Locate very, very, very long bolts with the same thread pattern as the bellhousing bolts. Cut the heads off the bolts and use those as giudes for sliding the tranny back on.
My bonus tip....get an extra set of hands when sliding the tranny back on.
Set aside a Saturday morning and start early. If this is your first one, plan on a 6-8 hour job.
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Jim Pastorius
2008 Silverado VortecMax
1992 Camaro
CMC#92
2002 BMW R1150R
2009 3rd Place CMC Mid-Atlantic Championship
2009 CMC Hyperfest Winner