I'll be replacing my CV boots soon and was planning to clean out all the old grease and put in new grease. Should I pack the whole thing full of grease, including the boot, or is just packing the joint / bearing itself sufficient?
There should be no grease in the boot. The CV joint casing doesn't need packing fully with grease. Pack enough in to cover all the moving parts. If a sachet of grease is included in the kit, then there usually is enough for one joint.