A screw driver will remove the old seal. If you are good with a hammer, you can install the new one that way. I will typically find a large piece of steel or something else to use for installation. If you have some large sockets (roughly the same diameter as the seal where it presses into the axle tube), they will work good.
I just installed Cardone cv shafts in my blazer. To me they just looked better than the "made in China" shafts that I just pulled out after only about 17K miles. My vibration in the front end seems to have gone away as well.