Try to get hold of an Haynes #1641 manual for Isuzu Pick-up and Trooper
1981 thru 1991.
ISBN 1 85010 790 4
Kind regards,
Erik-Jan.

You may wish to read this first...
http://www.4x4wire.com/isuzu/tech/CVboots/?
and search these forums for CV boots...
http://www.4x4wire.com/forums/postlist.php?Cat=&Board=UBB86
http://www.automotiveforums.com/vbulletin/forumdisplay.php?f=240
http://forum.planetisuzoo.com/index.php
And you can go to the Autozone web site and click through "Repair
Info" to an on-line manual for your make and model that is roughly
on-par with a Chilton manual.
The first link above is to a method of CV boot replacement without
needing to remove the axle shafts.
From the article...
"The standard procedure in maintenance manuals starts off by saying
"Remove the drive axle".  No joke.  It could actually mean remove the
entire axle (axle housing, differential, half shaft assemblies etc),
but typically the "drive axle assembly" in IFS refers to a half shaft
assembly with both CV joints, boots, etc already assembled.

Either way, removing the half shaft assembly is a lot of work.  You
have to drop the axle housing to remove the complete inner CV joint
and you need to disassemble the hub / rotor / spindle assembly to free
the outer CV joint.  If all you need is new boots, then this is way
too much work to do the job.

The method I describe here is a short cut to changing the boots.  The
idea is to separate the inner CV joint with the axle housing, spindle,
hub etc. still on the vehicle.  After doing so, you can pull the inner
CV joint apart to clean it, then change the outer boot and clean that
joint as well."