The boot of my CV axle was ripped as well but learned replacing the whole CV axle would be easier and cleaner than trying to put a new boot on. Also putting on a new CV axle gives you that piece of mind that it is a new part that shouldn't break anytime soon.
I swapped out a new CV axletwo weeks ago but pushed the seal too far in and now i need to redo the seal. Gonna take me a couple hours to redo this. Do not push the seal on the opposite side of the wheel in too far or it will leak.