To replace the boots you have to take things apart down to the axle shafts so it is an in depth job. You can get kits that use split boots that can be put on without tearing everything apart, but split boots basically start out leaking as bad or worse than the torn ones you are replacing. Then they get worse from there. Also, if your boots are already torn, you really need to clean and regrease the CVs anyway since they will be packed with mud and crud.
Sorry I don't have better news for ya, but my tips would be stay away from split boots and prepare for a big project. This is one of those snowball projects too, since it is all torn apart you might as well do brakes, repack wheel bearings with grease, ball joints could stand to get replaced, etc etc.
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95 Isuzu Trooper Daily Driver
86 Isuzu Trooper reliable backup
77 LUV 2wd stock beltway blaster (resting)
79 4x4 LUV project: 2.6L, 5spd, 31s (eventually)
MEPR: Man, my 4x4 makes all other LUVs look good