Correct. Typically, when you are redoing your CVs, you are replacing the boots at the same time. Even if only your outer boot is cracked, you should replace both boots while you are in there. If you are replacing the entire half shaft with a new one, it should come with the outer shaft already greased and booted, and the inner shaft with the boot on there, and then you just have to grease the cup and CV joint, insert it into the cup, replace the retaining ring, pull the boot over the cup, and attach a new band clamp.
When I did mine, I just cleaned and lubed the CV joints and replaced both boots. As Billy said, you might be able to get away with a heavy duty zip tie, but a proper band clamp attached with the proper tool is really the best way to go.
This is the tool you want, any parts store should have one for sale.
http://www.summitracing.com/nv/parts...3013/overview/
So, are you installing new CVs or just regreasing and replacing boots?
This should also help: http://blog.isuzugeek.org/2011/08/ve...e-rebuild.html
Mind you, when I did mine, I was also replacing the inner axle seals, so I had the whole axle dropped, but the pics might help.
Bart